BULLBALLS ball-stretcher was the first and most popular silicone ball-stretcher from Oxballs. It's now had a revamp with a more durable and usable design. The dimensions thickness diameter are as the original but the shape is more refined with a little more squeeze in the middle a better rolled edge for comfort and better stretch. This thing just fits and feels right. Made of pure platinum cure medical grade silicone it feels like skin and warms up to body temperature fast. It also doesn't irritate skin so can be worn longer that stretchers made of other materials like neoprene. Made in USA - design copyright OXBALLSPure Platinum Cure SiliconeLube safe: water-base oil base water/silicone hybrid silicone lubesCleaning: detergent and hot water dishwasher or soak in bleach-water solution Total Length: 2 inch/5cmTotal diameter: 1 7/8 inch/4.5cmUsable Length: 2 inch/5cmInside Diameter: 1 inch/2.5cm?