It's made of PU foam material, it can float on the water, which is durable and non-toxic, easy for you to carry and store, which fits for water sports including boating, fishing, whitewater rafting, canoeing, sailing, jet ski, water skiing, and other water sports, prevent your key from dropping into the water and going missing.It's designed to be oval shape, bright color makes your keys easily identifiable and keeps your keys float in water, it's nice accessory for all your aquatic adventures.