Made of super-strong SKINFLEX-TPR, our best material for strength and serious stretch. Stretches 5X its size and snaps back every time.Dont worry about sizing, with 2 rings and the serious stretch these rings have, you will find your perfect fit.Skinflex-TPR, Phthalate FreeLube safe: water-basedCleaning: detergent and hot water, dishwasher, always wash and dry any stretchy sex toy after use, they will last longer.