An '8' shaped cock and ball ring from Screaming O, the Ofinity Elasto-Stretch Rings, made of soft, non-toxic rubber, are attached for ease of use, and stretches around the base of the shaft and the testicles for a snug fit. Restricting blood flow in the penis, the Ofinity offers him stronger, harder erections and allows him to last longer in bed, great for premature ejaculation issues and as a way to build up more intense orgasms. For your safety, the Ofinity should only be worn for 30-45 minutes at a time. One size fits most.