The Silicone Gasket is a thin, circle cock ring made from health-grade silicone and designed to fit perfectly and enhance your size and thickness. This Large size is top-rack dishwasher safe and completely phthalate-free and body-safe. Approximate Product Dimensions: Large - C-Ring, Width/Diameter: 2.5 in. (6.4 cm), Unstretched Inner Diameter: 1.75 in. (44 mm), Depth: 0.4 in. (10 mm) Medium - C-Ring, Width/Diameter: 2.25 in. (5.7 cm), Unstretched Inner Diameter: 1.5 in. (38 mm), Depth: 0.4 in. (10 mm)