ShockTamerShockTamer Protect yourself from tennis elbow, golfers elbow, carpal tunnel, muscle stress and fatigue! Absorbs 70% of harmful vibrations according to testing conducted at the Massachusetts Institute of Technology Used by tennis players, golfers, baseball players, pistol shooters, carpenters, gardeners, keyboarders and bikers. Lightweight strap with a Velcro fastener adjusts easily to comfortably fit anyone's wrist. Effectiveness has been verified in five separate studies conducted by independent researchers.