The swim hand paddles are made of PC Material, they are light weight, does not impose an additional burden on swimming. Hand paddles have many drainage holes and water channels, low-impact will allow you to build muscle safely. The swimming paddles for hands adopts an ergonomic design, improves the comfort of the hand when swimming Swim paddles help to release more hand strength when you are swimming. Make swimming more labor-saving. Suitable for a variety of posture: such as butterfly stroke, backstroke, breaststroke and freestyle. Specifications: Material: PC +Silicone Size: as picture show Package Included: 2 x paddles