Encore Medical Replacement Penis Ring #4, Reusable, Easy to UseEncore Tension Bands or Penis Rings are for patients who can achieve but not maintain an erection, or who suffer from premature ejaculation. Also recommended by physicians in conjunction with Viagra and Injection Therapy. Encore tension bands are reusable and easy to use. Applies in seconds. These penis rings are so affordable many customers purchase them as replacement tension bands for competitors systems. Encore tension bands are manufactured with silicone.