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Sizing Rings

(38 customer reviews)

$49.95

ESSENTIAL – AND YOU GET $75 BACK!

Our 3D printed Sizing Rings take the guess work out of finding your perfect fit and each set comes with a $75 Discount Code to spend on a metal ring when you are ready. You really should take this extra step to ensure your success, our Returns Policy prohibits return or exchange of used genital rings.

King Rings’ 2mm size granularity makes a tailor fit experience possible, our Sizing Rings are the best way to take advantage of this. Whether you are new to penis rings, an experienced user, or a long time collector, our Sizing Rings are a valuable tool. Not only are they “less than free”, these rings can help you spend your money smarter.

Free shipping in the US. | Discounted International Shipping

Read more below for important details!

In stock

SKU: KR-SIZERS-PLA Categories: , ,

Description

BE ASSURED A PERFECT FIT

Our 3D printed Sizing Rings are the same sizes as our heavy metal rings, fully functional, and will help you discover your perfect fit prior to investing in a lifetime accessory. We print them in-house with body safe, biodegradable PLA plastic (color shades vary) and the cock rings have a proprietary engineered breakaway feature – for the safest sizing experience possible. Our size range is adequate for most men but you may choose to verify you are in range with our Sizing Guide.

LESS THAN FREE!

The complete Sizing Rings Kit is a bargain at $49.95 but it ALSO comes with a $75 Discount Code for future use – we give back 150%! The code is valid for 6 months and can be used to purchase any regularly priced metal ring. Discount cannot be combined with other offers or discount codes, minimum purchase is $100.

INCLUDED IN THE SIZING RINGS KIT
  • Cock Rings: 8 sizes, 42-56mm
  • Glans Rings: 6 sizes, 22-32mm
  • Teeny Tiny (finger) Ring Sizing Tool
  • Printed Sizing Guide and other information
  • Small piece of sandpaper, just in case
  • (Cock ring size 58mm available on request)
HOW DO THEY COMPARE TO METAL?
  • Cock Sizing Rings: Band width and thickness are the same as our standard metal cock rings but not quite as thick as GOLIATH.
  • Glans Sizing Rings: Band width is 12.5mm – midway between our Slim (10mm) and Wide (15mm) styles – and thickness is the same as all our metal glans rings.
  • Fit and Feel: Plastic is a poor proxy for the heft of metal when worn casually but our sizing rings perform exactly like our metal rings during playtime. Our Fitting Guide will walk you through.
FREE SHIPPING

No cost USPS First Class shipping to U.S. addresses. International shipping is discounted, see prices during checkout.

SIZING GUIDE

Included in each kit, our printed Sizing Guide contains steps to help you through the fitting process. Its contents are proprietary and developed over years of coaching gentlemen through fitting.

NEW CUSTOMERS ONLY

Sizing rings are intended for first-time customers only. If you’ve ordered from us before and need help with sizing, please contact us for assistance.

Cock and Glans Sizing Rings

Photo Disclaimer: Some of the product graphics on this page are not photographs but are computer generated from 3D models. Actual rings are shown in the “Sizing Kit” photo above.

Alternatives

DO IT YOURSELF

Download the 3D models and print the rings yourself or with the help of a local print shop. If you live outside the U.S. this could be a good option, ask us about our DIY discount when you come back for a metal ring in your preferred size.

GET A SINGLE RING AT CHECKOUT

You also have the option to add a single Sizing Ring to any metal ring order during checkout. This will allow you to verify your ordered size before unsealing the high value ring (see our Returns Policy) but what you don’t get is the opportunity to compare different sizes. We offer this option but do not recommend it.

Product Data

Material

PLA plastic, Biodegradable

Band Width

Glans: 15mm, Cock: 20mm

Band Thickness

6.5mm

Color

Colored by size as shown, shades vary

Reference Info

Sizing System | How To Wear | Care and Cleaning

Customer Review Summary

38 Reviews Total★★★★★4.99/5
Product Quality★★★★★5.00
Customer Service★★★★★5.00
Overall Satisfaction★★★★★4.97

Customer Reviews

★★★★★
Michael S • June 1, 2026
Verified Owner🇺🇸 US

I tried measuring myself multiple times and over multiple days and couldn’t get the same measurement twice. I found these and decided to save myself from further aggravation. They worked great! I was able to size down to find the right size for both the c ring and the glans ring.
The sandpaper included helped to smooth things out on the sizing rings and I was able to test drive multiple sizes, wearing them all day to make sure I got the right fit.
Make the right call and buy these!

★★★★★

A must-have product if you want to purchase a quality ring

Stephen • April 26, 2026
Verified Owner🇺🇸 US

These are simply a must-have before you order one of Scott's outstanding, high-quality luxury rings. Even if you "know" your size, order these. The combination of sizing rings for member and glans rings gives you the opportunity to try multiple sizes in easy comparison and really get your fit dialed in for how you plan to use your rings.

Scott provides outstanding customer service and will answer any questions you may have; he is extremely knowledgeable and very helpful.

★★★★★

An essential step before ordering the real thing

Brian H • March 21, 2025
Verified Owner🇺🇸 US

The detailed instructions helped me figure out what to expect when getting the real thing. Great for finding the right size with the 2mm differences. I suggest finding what will absolutely not fit first and only moving up one size. The weight of the tungsten rings will be incredible and finding the biggest sizing ring that will fit would be a mistake. Follow the instructions and take your time. I did not need the sand paper that came with them as every ring I tried was all smooth for me. I am glad that these were an option for getting fitted properly and especially awesome with the discount that comes with them!

★★★★★

Highly recommend you start here

Antony A. • February 24, 2025
Verified Owner🇺🇸 US

This was my first introduction to C-rings. I'm on the smaller side and a heavier guy, so I was afraid these rings wouldn't even fit! With the price tag. I wanted to be sure, so I went ahead and bought the sizing it and man oh man was it worth it. I ended up needing a 42mm, which isn't included in the kit. Scott, that awesome king, sent me a 42mm free of charge!( if you think you need it, let them know before they send it out). I confidently made my first order today and and am very excited to receive my jewelry!

★★★★★

Please buy!

Mitchell • February 3, 2025
Verified Owner🇺🇸 US

I have used gland rings, which were easy and accurate to measure, and have owned stretchy cock rings. I tried measuring at least 5 times and came away with 3 different measurements, but this allowed me to find the perfect fit. I kept going smaller, until I got to the point where I was searching for frozen peas and wire snips. I ended up buying the size above, and utterly endure using it! The precise sizing here is worth the cost! I have nearly wasted ~100 on cheaper stainless steel pieces.

★★★★★

Must be the first step

Simon • February 1, 2025
Verified Owner🇺🇸 US

I do recommend everyone to get the sizing rings to find out the right fit. Don’t forget to choose one size smaller than the size you think is right! I took the advice and went for the smallest size I could feel comfortable in, and it turned out to be a perfect fit. Try this first. You won’t regret.

★★★★★

Wonderful Sizing

Chantelle • November 29, 2024
Verified Owner🇺🇸 US

Ordering this set made my buying experience so much easier, and it allowed us to test fit different size rings to find the most comfortable fit.

★★★★★

Worth Every Penny!

Brock • November 25, 2024
🇺🇸 US

TL;DR Do NOT skip on these. Period! If you’re going to make an investment in some great looking jewelry, do yourself a favor and make sure it fits properly.

These are an absolute must for making sure your investment in a King Ring is a successful and satisfying experience. I did manual measurements with a tape and thought I was good but had I ordered, I would have been disappointed. Thankfully, Scott pointed me toward these bad boys. I bought the files, printed them at home, and started my at home testing with my initial size. Turns out, my initial measurements were a bit off… I worked my way down one sizing ring at a time until I got to that one that was just right. (You’ll know when you go too far, trust me.) I ended up going down 3 sizes!

Thanks, Scott, for making sure I had a great first experience.

★★★★★

A must buy before making the investment

Ramon P • November 17, 2024
Verified Owner🇺🇸 US

The sizing rings make buying your first ring a pleasant experience. Buying the sizing rings allowed me to test several sizes before I invested, making all the anxiety of purchasing the proper size disappear. If you are investing in King Rings, it’s a must to buy the kit.

★★★★★

glad I ordered

Daniel W • September 20, 2024
Verified Owner🇺🇸 US

I was about to submit an order based on previous measurements when I decided I should order the sizing rings just to be sure. It was "risk free" in that I'd receive a discount code for a future purchase that was larger than the price of the sizing rings. Glad I ordered them! I wound up ordering the final products in slightly different sizes than my earlier measurements suggested, and the final fit is *perfect*.

★★★★★

A perfect set to make sure the size is right

Howie • August 13, 2024
Verified Owner🇺🇸 US

Received and used these to find the right size for my rings. Glad I did and you will be as well.

★★★★★

A no-brainer if you are a cautious shopper

Charles • August 3, 2024
Verified Owner🇨🇭 CH

Perfect to really get a grip on size, and with the voucher makes your first purchase less risky and cheaper!
Strongly recommend

★★★★★

Easy

Franklin • December 1, 2023
Verified Owner🇺🇸 US

The sizing rings makes the whole process smooth. I tested several of the sizes before I made a decision and it took all the guess work out of sizing. If you’re planning to buy a King Ring it’s foolish not buy these first. The coupon by itself makes it worth it.

★★★★★

Best way to get the right size.

David R • November 23, 2023
Verified Owner🇺🇸 US

If you already plan to purchase a ring, these fitting rings are a must to ensure the fit you want. I tried printing them myself with my own 3D printer but I could not match the quality of these.

★★★★★

Sizing Rings

Marvin S • October 27, 2023
Verified Owner🇺🇸 US

I purchased the sizing rings specifically for the glans sizes. I put on the 24mm ring and wore it around for a while. FYI, I am a grower not a shower and when my penis is soft all the excess skin gathers behind the head. The pressure of the excess skin would cause the 24mm ring to slip off. I contacted Kings Rings and the immediately sent out a 22mm sizing ring at no extra charge. Outstanding customer service. The 22mm is the correct size. These sizing rings take all the measuring and guess work out of ordering the correct size. Plus, you can wear it around to make absolutely sure. Great easy to use product.

★★★★★

A good investment

James F • October 24, 2023
Verified Owner🇺🇸 US

I highly recommend getting the sizing rings before purchasing. This made all the difference!

★★★★★

Thank you

Susan B • September 5, 2023
Verified Owner🇺🇸 US

Great Sizing option.

★★★★★

Deliver fault

C.Hamlin • August 11, 2023
Verified Owner🇺🇸 US

Got the sizing kit in today. The package seemed to be a little rough. Opening it the biggest size 58mm was broken, the rest were all good in shape. Even tho I think the 58mm would be a little to big for me just disappointing. Now I’m blaming the handling 100%, it’s not that heavy and it sounds like legos.

★★★★★

True

Joshua B • August 4, 2023
Verified Owner🇺🇸 US

These are true, I bought the set and tried on multiple. The sizing guide is on point. Follow it for help, or email for assistance. Weight of the true rings is different!

★★★★★

A must buy before purchasing a ring

Robert B • July 22, 2023
Verified Owner🇺🇸 US

Take the time to buy this sizing kit first. It will be of great aid in the purchase of your ring because it takes all the guess work out of proper sizing. Comes with a coupon code that applies to purchase of the actual ring you select. This makes the satisfaction difference and it a brilliant idea.

★★★★★

Very helpful

Gary G • June 12, 2023
Verified Owner🇺🇸 US

Worked exactly as expected for perfect ring results with first order!

★★★★★

Decisive Purchase

Brian S • March 25, 2023
Verified Owner🇺🇸 US

You're gonna put a lot of money into your precious jewels, make sure they fit right! With the added bonus of a discount on whatever ring you choose!

★★★★★

Absolutely necessary

Christopher B • March 13, 2023
Verified Owner🇺🇸 US

Do yourself a favor and get the sizing rings

★★★★★

A must

John M • March 11, 2023
Verified Owner🇺🇸 US

These are a must!! I was able to comfortably order a size smaller than I thought due to being able to practice with the plastic to get comfortable with a perfect fitting ring. And the discount you get when you order the sizing rings makes it a no brainer.

★★★★★

Sizing rings

AV • March 6, 2023
Verified Owner🇺🇸 US

Gentlemen- do yourselves a favor and get the sizing rings. You won’t regret it. Take your time testing them in real world scenarios and go snug to avoid slippage. The real things are a lot heavier. Cheers!

★★★★★

Great assortment of sizes!

Logan W • February 23, 2023
Verified Owner🇺🇸 US

Love the variety of sizes available. Small increments make it easy to size up/down. Give each ring a day of wear to find your best size!

★★★★★

It's not rocket science

Dante H. • February 21, 2023
Verified Owner🇺🇸 US

If you're new ro wearing member rings this is worth the investment if you're planning on buying rings of any sort. Yeah it's they're just 3d printed PLA rings but the discount more than makes up for it. That's at least 30-40% off of a glans ring at least so..... Sizing rings plus a gift card is a pretty good gift.*wink, wink

★★★★★

I definitely recommend these!

Shawn • February 3, 2023
Verified Owner🇺🇸 US

These are well made and a really good way to determine which size is best for you. And if you buy them for $50, you get $75 off your first order. That's a really good deal. For me, I figured out 3 sizes that I thought would be good and it was great to have the opportunity to see how they fit and felt flaccid and erect to narrow my choice down to the exact right size that was perfect for me so I knew what to order. I highly recommend getting these.

★★★★★
Greg L • November 6, 2022
Verified Owner🇺🇸 US

The base rings given were perfect for running a trial by fire on various ring sizes. I would definitely recommend following the included instructions and slowly size down. I realized my base is larger than I thought during the process! The included $50 coupon incentive (more than the cost of the size rings!) really just goes to show Scott's commitment to providing a quality product. If you are remotely interested in any of the rings in the catalogue, this is definitely the place to start the journey!

★★★★★
daretoask88 • August 29, 2022
Verified Owner🇳🇱 NL

The sizing rings work great, I went for the full set and even though it turns out a glans ring was no option for me, it did give me the option with this measuring set to check for a nice "shaft" ring instead!

I stole Konrad F's idea and will use this set when I go swimming so I do not have to worry about damaging the brand new c-ring

★★★★★
Scott M • February 9, 2022
Verified Owner🇺🇸 US

These sizing rings were fantastic in allowing me to dial in my Goldilocks fit. I wanted to find the size that would allow me to wear a ring all day but still get good constriction when hard. The added discount code made this a no brainer purchase!

★★★★★
Dustin G • January 16, 2022
Verified Owner🇺🇸 US

These are a great value and they're good for first time users of cock/ glan rings compared to the cheap rubber band ones. That don't really work for a daily driver type of rings.
Now I'm wondering if the metal ones grip my member better than these?

★★★★★
Jason • November 4, 2021
Verified Owner🇨🇦 CA

I have never worn a ring before so very glad I decided to start with the sizing rings. They are amazing for getting used to the thickness and the feeling of wearing a ring. The only thing I personally would suggest is that once you find one that is comfortable, see if you can fit in the smaller size and still be comfy hard as when I gave them to a friend to try he chose a size and wished he had gone one smaller when he purchased an actual king ring because the weight made a big difference. Being small when soft I thought the 52 was best but once he told me that I tried the 50 and was still able to have an amazing release so ordered a 50 and have to agree with the weight it stays in place better being a size smaller.

★★★★★
Kevin • February 1, 2021
Verified Owner🇺🇸 US

These were very helpful to me in the decision making process of which C-ring to buy. I have worn cheap metal and stretchy c-rings before. The metal rings were all too small and painfully tight. The stretchy ones pinched and were too elastic to constrict blood flow during sex. I would recommend anyone considering purchasing one of King Ring's metal rings purchase a set of sizing rings, even if you've worn C-rings before and think you know your size. For one thing, these are less than free with the generous coupon which you will receive. Secondly, I found that the experience of wearing a 20mm wide ring vastly different from the narrow, cheap, metal rings. In my experience, the extra width added to the comfort of wearing the ring for extended periods and improved constriction when erect.

I ordered a 50-58mm set of sizing rings and Scott was kind enough to throw in a 64mm ring as well. Dealing with Scott was an absolute pleasure. He answered my questions amazingly quickly and was very helpful. He really wants you to be happy with the "real" ring you eventually purchase and confident that it will be the correct size.

Wearing these sizing rings will make you even more eager to get one of King Ring's gorgeous creations.

★★★★★
Michael H • September 7, 2020
Verified Owner🇺🇸 US

These were perfect for learning how to put on a ring. I was so glad I ordered a set. It got me acclimated to wearing a ring with such an awesome thickness - after a few days of all day wear, I almost forgot I had one on during the work day. I also now know that there are three sizes I can comfortably wear, and which of these three is my ideal Goldilocks fit. Customer service was great, and Scott checked in a few days after delivery to see how the fit was and to let me know he was available for any questions about sizing and fit. And it promptly came with a coupon for my final King Ring order!

★★★★★
Augustine • August 16, 2020
Verified Owner🇺🇸 US

I’m so glad that King Rings offer the sizing rings. Me and my husband have both worn cock rings but nothing with this thickness before. It’s awesome! we both found our size and wearing the daily and trying on the different sizes to find out perfect match. We’re both still deciding on what ring we want to purchase as our “daily driver.” Hoping to pick up two soon! Thank you Scott!

★★★★★
Danny • June 26, 2020
Verified Owner🇺🇸 US

A unique offering and excellent first step towards choosing a King Ring. Great for practicing how to put on and take off a ring, especially for the newbies. Also helpful in understanding how a ring of this thickness will feel worn for long periods of time under clothing, with or without underwear, and also during arousal and release. A smart purchase before deciding on a metal ring.

★★★★★
Konrad F • May 8, 2020
Verified Owner🇺🇸 US

I bought these to make sure I was getting the correct size. They are light weight and comfortable to use. After finding my size I think I could even use these while swimming in a chlorinated pool so I won't have to worry about damaging my good one. Included is some fine sandpaper to smooth out any rough edges - thoughtful touch.

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