This is a set of three 100% silicone rings in medium (1.25" x 1.25"), large (1.5" x 1.5"), and extra large (2" x 2"). The rings that I received were black, but I've noticed ones in other reviews that were different colors. They felt firm and were much harder than I expected, but could be pushed and bent if needed. They were perfectly round. The package said to not use them for more than 30 minutes at a time and to wait one hour in between uses--permanent damage can result if those instructions are not followed, and they may cause some bruising.

I don't have a penis, so I gave them to a friend to try out. He used them while masturbating and also while having sex. He used the medium ring because the two larger rings were not tight on his shaft. He said that he experienced some bruising when he first put it on, but that it slid on much easier the second time with some lubricant.

He experienced considerable improvement in longevity both when masturbating and during intercourse. He remained erect after ejaculating and said he felt ready to go again. He was surprised that it didn't hurt or detract from his experience in any way--both masturbation and sex felt the same; he just lasted longer. He really enjoyed them and said it wasn't anything he had considered using in the past, but that he would definitely use them in the future for both masturbation and sex.

I've heard of rings being used one at a time, like my friend did, or multiple rings on the penis at the same time. The larger rings are sometimes used on the scrotum.

Silicone is an extremely safe material and receives a 10 on Eden's safety scale. It can be fully disinfected by boiling for three minutes or by placing in the dishwasher. It can only be used with water-based lubricants.

My friend continues to immensely enjoy these rings. He has used them almost every time he's masturbated since he got them and he said they've really improved his experience. He's tried the larger one on his testicles and said it was surprisingly comfortable.