My 2nd ring purchased at 50mm.

Based on my experience with my 1st ring which was the Pulse Flex at 45mm.

More experience may lead me to order again but at 45mm.

I have a collection of different cock rings from Greek, Dutch and British designers but the Primal:Fusion is the most comfortable one so far. You can wear it 24/7 and you wont even feel it and it there when you need it. If it's not on, it's not in...

The shape of the primal rings is so much better than the round rings I have used in the past, highly recommended. I use the larger size for daily wear and one size smaller for romantic interludes.

Let me start by saying I have been an avid CR user for many years I’ve got a lot, I stumbled across Primal 1 evening and was impressed by the quality look and stylish finished these ring have. I instantly purchased the Power Flex Satin Black Ring 45mm. When I arrived I dint waste anytime putting it on! love that ring!
I recently purchased the Fusion Matt Stainless Ring. I’m pretty confident with my size for round rings being 47-48mm. I have a full set (4) curved SS CR from another designer and I bounce between the 45 & 47 ones depending on the use (45 for play 47 for daily).
Because there was an instruction link on measuring for Primal I decided to double check my measurements. My results varied between 45-50. I decided to go with the 45, when it arrived I was excited to get it on!
So I warmed it up, slapped on a little nut butter cream and away I went, that’s when things got tricky, the keyhole design is quite unique to Primal. I finally got it on and wow it was tight and I wasn’t even chubbed up, So before the blood rush, I took it off!
Looks like I will be getting a 50 down the road when an offer or sales comes up!

I started down this journey with stretchy silicone rings and more recently a circular non-stretchy silicone ring from another company. I enjoyed both but the later was really difficult to get my nuts into it and was starting to cause some slight lingering pain in the lower right part of my scrotum. With the Primal ring shape it is much easier to slip my nuts into due to the elongated shape and the slight pain I had been experiencing seems to have gone away as it’s fit is much more ergonomic.

The sizing was also spot on for my needs - adds a good amount of chub without being too restrictive. The silicone ring mentioned above would often restrict my ejaculation which was mentally and physically unsatisfying. I measured about 6.25-6.5” diameter according to the sizing instructions and so went with the 50mm. Was somewhat worried the Primal would be too loose as they mention going down a size from your current ring (52-53mm), however, in retrospect, the previous ring was probably too small given my issues with it.

Fit and finish is excellent. Comes with a nice storage pouch with a snap button. Sent in a sturdy little box. My only quibble is the return address says “Primal Rings”. Not an issue for my current household but I wouldn’t want a child, parent or roommate to google it. It’s unusual since most sex toy shops and manufactures ship under a pseudonym.

Have enjoyed it on my own and once with the wife so far. I had been wearing the other silicone options recently so I’m not sure she noticed the difference. There were no complaints on her end and she seemed somewhat more satisfied than usual.