Our ACTIV Erection Ring is made from medical, non-irritant silicone and is a natural device for keeping the penis erect. Soft and extremely comfortable, they come in four different sizes to allow for individual fitting. By placing them on the penis, blood, which keeps the spongy body stiff, is stopped from flowing back. This maintains the erection and allows for long-lasting sensuous intercourse. They are for use either on their own or with a vacuum erection device (penis pump), for men who have difficulty maintaining erections or who would like to maintain an erection for longer. Men that can achieve only a partial erection find erection/constriction rings help to improve the firmness of their erection. Rings are designed to be placed around the base of the penis, gently providing pressure to help achieve and maintain an erection. As with all erection rings, these are not to be worn for more than 30 minutes at a time.