Aqua Sphere Vortex V8 Hand Paddles Swim training hand paddle builds upper body strength while encouraging improved stroke mechanics Ergonomic contour promotes a correct, slightly cupped hand position and prevents dropping the elbow during the pull by placing the center of force in the palm of the hand Extended tip maximizes angle of hand entry and extends distance per stroke Made in the USA; Injection molded high density polyethylene with silicone straps