There are many kinds of penile aids. Generally speaking for penile erection aid rings. The earliest history of the ring used to treat male penile erection is that people took off the eye ring of a sheep and set it on the male penis as a physical aid to male erection lasting, and psychologically enhance male self-confidence, so the common name of this ring is sheep's eye ring;

However, because of this ancient use of sheep's eye skin as an aid is not only cruel, and because the eyelashes on the sheep's eye easily residual bacteria, when using will also cause Therefore, recently, some people use silicone or rubber to make an elastic auxiliary ring, with the purpose of providing a safe tightening using the force of the erection of the penis itself.