A penis ring fits around the base of the penis, or the penis and testicles, and applies pressure to the surrounding area. This pressure squeezes the blood vessels that carry blood out of the penis and causes blood to leave more slowly. 

A penis ring will trap blood in the penis for longer and increases the total amount of blood in the penis for a stronger erection.

This ring has two loops to surround the testicles as well as the penis. Quick Release.