HUJ c-ring is our favorite grippy ring you will want to use and use often--just the right size, it's the perfect c-ring or ball-ring that stretches to fit a range of sizes...it can be layered for a tighter fit or some guys stack them for gradual ball-stretching. Hnkyjunk innovates even in this simple design, HUJ c-ring has a groove inside the ring that flattens out when worn, this keeps the ring in place and keeps a bit of lube between the ring and you for comfort. HUJ c-ring has a flatter inner opening so it won't roll, snag or pinch. Hnkyjunk PLUS+silicone TPR/silicone blend: silicone for a smooth and warm feel, TPR for amazing stretch and strength. Phthalate free. LUBE SAFE: Water-based lube, hybrid or silicone lube, oil-base lubes not recommended. CARE: Wash after use in warm soapy water, air dry. Store toys separately :we recommend storing in breathable cloth pouches or for larger toys, in cotton socks.