Yess cock rings are a lot of fun! Silicone, leather, or rigid? They're all different experience.
I’m a fan of nitrile. Silicone is easy to fit because it tends to have a lot of stretch, but I find it also tends to pinch a bit because of that stretch. Nitrile is still relatively soft and has some stretch, but quite a bit less than silicone. Less stretch means you need to buy the right size, but they are inexpensive and you can get multipacks to figure out what size you need.
That's very interesting thanks for sharing. I've had pinching issues and never heard of nitrile (rubber?) rings before. I'll have to check it out.
Yes, “Nitrile Rubber”, not to be confused with natural/latex rubber, butyl rubber, etc.
Nitrile is the standard material for latex-free exam gloves.