Back to Cock Rings

Sizing Rings (c-rings)

(4 customer reviews)


Our 3D printed Sizing Rings take the guess work out of finding your perfect size! Each set of rings comes with a $50 Discount Code to spend on a metal c-ring when you are ready.

Measure first to get an idea of which set will work best for you and see details below.

You also have the option to:
1. Increase the range of your Sizing Ring set with additional single rings.
2. Alternatively, add a single Sizing Ring to any metal c-ring order during checkout. This will allow you to verify your ordered size before unsealing the high value ring, see our Returns Policy.

Free shipping in the US. | Discounted International Shipping

Clear selection
Add to Wishlist
Add to Wishlist
SKU: KR-SIZERS-PLA Categories: , Tags: ,


Be assured of a good fit! Our 3D printed Sizing Rings are the same dimensions as our heavy metal rings and will help confirm your size prior to investing in a lifetime accessory. The Sizing Guide is great help but, if you need a little extra assurance, these plastic versions are very useful! We print them with body safe PLA plastic which is biodegradable and compostable. Colors vary.

Less Than FREE – Each set of rings comes with a Discount Code worth $50! The code is valid for 45 days, can be used to buy any regularly priced metal c-ring (Tungsten Carbide or Stainless Steel) but cannot be combined with other offers or discount codes.

Expand The Base Set: Want to test a wider range? Once you add a set of Sizing Rings to your cart, include additional rings and we’ll ship them all together!

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

Free Download: If you would like to print rings yourself or with the help of a 3D printing service, download the printable 3D models.

Get A Single Ring at Checkout: You also have the option to add a single Sizing Ring to any c-ring order during checkout. This will allow you to verify your ordered size before unsealing the high value ring, see our Returns Policy.

Photo Disclaimer: The product graphics on this page are computer generated from 3D models and not of real-world, printed products. If you’d like to play with an even better rendering of the ring, you can explore all sides here. Color of actual printed rings varies.

Product Data


PLA plastic, Biodegradable


44-48mm, 44-50mm, 44-52mm, 46-50mm, 46-52mm, 46-54mm, 48-52mm, 48-54mm, 48-56mm, 50-54mm, 50-56mm, 50-58mm, 52-56mm, 52-58mm, 54-58mm

Band Width


Band Thickness

6mm, 6.5mm (varies by size)


Colored by size as shown

Reference Info

Sizing Guide | Fitting Guide | How To Wear | Care and Cleaning

4 reviews for Sizing Rings (c-rings)

  1. Konrad F (verified owner)

    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.

  2. Danny (verified owner)

    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.

  3. Augustine (verified owner)

    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!

  4. Michael H (verified owner)

    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!

Add a review

Your email address will not be published. Required fields are marked *