About this itemTHE ORIGINAL SPRING-LOADED HAND & FINGER EXERCISER: Prohands is used by professional athletes, world-class musicians, and as a rehabilitation tool. Made from high-quality components ABS plastic, stainless steel springs and approved santoprene.STRENGTH, POWER & ENDURANCE FOR ATHLETES: Exercise each finger individually, or the entire hand. Isolates and exercises each finger individually for strength, dexterity, and endurance. Develops outstanding hand, wrist and forearm strength.REHABILITATION & PREVENTION (STRONGER, HEALTHY HANDS): 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 EXERCISERS (2ND IMAGE): VIA is our entry-level model, GRIPMASTER is our signature model, GRIPMASTER-Rehab has an added palm cushion, and PRO is our most advanced model for pros and motivated individuals.VARIOUS TENSION LEVELS: Graduated tension levels help the user measure progress. VIA 1lb to 6lb, GRIPMASTER 1lb to 9lb, GRIPMASTER-Rehab 0.75lb to 9lb, PRO 5lb to 13lb. By isolating each digit, stronger fingers cant compensate for the weaker ones.