YONEX MUSCLE POWER Support Wrist MPS-60RIEX LeftSPECS: Available Sizes M 13 16cm L 17 20cm Material Chloroprene, Silicon, Nylon Item Code MPS 70ELEX Key Features: Controls hyper extension of ligaments. Yonexs new MUSCLE POWER SUPPORTER equipment integrates silicon to comfortably secure each joint and muscle. The combination of tape and silicon embraces your joints while moderately compressing muscle fiber and gently supporting ligaments against rapid movement.