The Individual Tension Rings made by Encore Medical are replacement rings that are used with the Food and Drug Administration or FDA approved vacuum therapy products designed for the medical conditions known as Erectile Dysfunction or impotence. Encore Medical is a manufacturer of medical vacuum therapy systems that are designed to be used to reduce the symptoms associated with the medical condition called Erectile Dysfunction. The rings are for support, tension, or constriction when using the vacuum therapy device during sexual intercourse and are intended to be situated at the base of the mans penis. One of the important qualities of vacuum therapy products is that they can aid in restoring sexual function without the use of drugs and are less costly and less invasive than surgery. The American Urology Association recommends vacuum therapy as a safe and effective choice for erectile dysfunction. These Encore Individual Tension rings are designed to be used by men experiencing erectile dysfunction and/or impotence and can be worn during sexual intercourse. The Individual Tension Rings purpose is to slow down the blood flow from the erect penile tissue, which allows maintenance of a rigid erection during an extended time period. The Individual Tension Rings are uniquely designed to provide the user with the most comfort possible and is super discreet at the same time. It is recommended that the Individual Tension Rings are not used any longer than thirty minutes at a give time and that at least sixty minutes in between each use. The Individual Tension Rings come in seven different sizes and can be used along with any FDA approved vacuum therapy system. Systems that are compatible include the following:Encore Vacuum Therapy SystemsOsbon Erecaid Vacuum Therapy SystemsPos-T-Vac Vacuum Therapy Systems