Silicone C-Rings from Tantus are broad for comfort and safety. A C-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. The 1.75 C-Ring is our most constrictive ring and would be used by someone who has experience with rings. The diameter has nothing to do with the size of your junk therefore the smaller the diameter. the more difficult the ring is to get on. but once on. the more intense it will play. For best results. apply lube to the inside of the ring. then ease one testicle through at a time before finally pulling your cock through. Diameter: 1.75 / 5.08 cm