Prohands Gripmaster is the original, patented hand exerciser with individual power buttons. Beware of inferior quality imitation products from Asia. Prohands is the very best hand exerciser used by professional athletes, world-class musicians, and as a rehabilitation tool. Made from high-quality components ABS plastic, stainless steel springs and FDA-approved santoprene. With Prohands you can exercise each finger individually, or the entire hand. Use each button independently to exercise fingers or compress the entire unit for complete hand and forearm strengthening. By isolating each digit, stronger fingers cant compensate for the weaker ones. Allowing the user to isolate and exercise each finger individually for strength, dexterity, and endurance. Helping to develop outstanding hand, wrist and forearm strength. Prohands is ideal for anyone wanting to develop and maintain strong healthy hands. May help with arthritis, carpal tunnel, neuropathy, and poor circulation. The Prohands family of hand exerciser comes in 4 different model types (2nd image). VIA is our entry-level model, GRIPMASTER is our signature model, GRIPMASTER-Rehab is our signature model with an added palm cushion, and PRO is our most advanced model for pros and motivated individuals. Each Prohands model features graduated tension levels, which help the user measure progress. VIA 1lb to 6lb, GRIPMASTER 1lb to 9lb, GRIPMASTER-Rehab 0.75lb to 9lb, and PRO 5lb to 13lb. Prohands is the ultimate hand and finger exerciser available on the market.