Let me start off by saying that this cock ring would be FABULOUS if it were made of a slightly stretchier material, TPR silicone would be my favorite.
My boyfriend and I bought this with the idea that we could wrap this around his balls and penis without having multiple loops to deal with. While that was possible, we measured this slightly too small for that and we'll have to buy another one. We can still get this around his balls and his penis but it's very very tight on him and takes forever to get on and off.
The main thing that drove us to buy this ring was the fact that it says it's "quick release"... We quickly discovered that it is not.

This cock ring is made out of not so flexible rubber. Rating a 3 on the safety scale, this one is porous but has very little smell. However, rubber does have an exceptional lifespan and will last quite a while, even with regular wear.
This particular ring is shiny, smooth and seamless. I wish it were a tiny bit stretchy for some forgiveness for those of us who measure once and cut twice. Sadly though, it is not stretchy in the slightest.
My boyfriend says he really likes this ring and would buy it again if we didn't muck up the cut, or if it were stretchier. He says while it is comfortable when wearing, it grabs his pubic hairs every time we put it on and take it off.

This cock ring, uncut, comes to be 9.5 inches long. If this doesn't fit your man, honey, I don't know what will! The best feature about this is that it is cut-to-size and will fit every one. Once you've cut this one too short, it's done and you need to buy a new one if you've cut wrong.
The most annoying feature about this cock ring is the snap closure. I thought this would be a simple *pop* on, *pop* off thing, but no. It takes a lot of pressure to close it and a lot of force to pop it off. "Quick release" should change it's name. This takes over a minute to put on correctly if you've measured it to be tight fitting. Waiting this long makes my boyfriend soft every time and we end up saying fuck it.
As I said, my boyfriend says this is comfortable to wear and doesn't give you the numbing feeling most rings give you.