The Donut is a classic shape C-Ring to help maintain those long-lasting erections you've always dreamed of. It's made from super stretchy TPE and it is completely phthalate-free and body-safe. Approximate Product Dimensions: C-Ring Width/Diameter: 2 in. (5.1 cm) Unstretched Inner Diameter: 0.9 in. (23 mm) Depth: 0.6 in. (14 mm)