Magnum Force Clear Cock Ring Set. The ultimate Silicone cock ring trio set with small, medium and large will keep you up all night. Water based personal lubricant is recommended. Cock rings when worn around the base of the penis and testicles, many users find that cock rings increase sexual pleasure. Prolong rings, erection enhancement, climax control rings, cock rings. Always clean before and after use. Many also be used as o-rings for strap on harnesses. Magnum Force Cock Ring Set from Nasstoys of New York. New 2013 image added.