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. Using our silicone to make the ring means it won't pinch or grab when sitting, walking, etc. and if things get bound up, unlike metal, you can just take a pair of scissors and easily escape rather than making a trip to the emergency room. The 2" C-Ring is our mildest ring and would be used by someone who has just starting out with rings. The diameter has nothing to do with the size of your penis 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 penis through. DimensionsWidth/Diameter: 2.75in (7cm)Unstretched Inner Diameter: 2in (5.1cm)Depth: 0.8in (1.9cm)