These Super Soft silicone c-rings from Tantus are broad for comfort and safety. A penis ring holds the testicles down and keeps the testes from contracting thus slowing down ejaculation. The constriction takes orgasm from about 6 seconds to up to 45 seconds. For best results, apply lube to the inside of the ring, then ease one testicle through at a time before finally pulling your penis through. Unstretched inside diameter of penis ring is 1.5 inches, stretched diameter up to 4.75 inches. Tantus expert advice: When a man ejaculates, the prostate's job is to shut off the bladder and push seminal fluid down the urethra. The testicles then contract and add sperm to the seminal fluid with the result of ejaculation. A c-ring holds the testicles down and keeps the testes from contracting thus slowing down ejaculation. Prolong ring is made using phthalate free, non-toxic materials Silicone. Always clean before and after use. Climax control, penis ring, non-vibrating ejaculation prevention.