The Hand Master Plus is used to strengthen and balance the muscles of the finger, thumb, hand, wrist, forearm, and elbow for both enhanced sports performance as well as to prevent repetitive stress injuries. The Hand Master Plus strengthens both the front (flexors) of the hand when squeezing the ball and the back (extensors) when opening the hand. This hand exerciser uniquely works through a full, natural, three-dimensional range of motion. The reciprocal muscle exercise strengthens, conditions, and balances the tissue of the hand, wrist, fingers, and forearm. Additionally, the Hand Master Plus can help treat Carpel Tunnel Syndrome; Tennis/Golfer elbow; Osteoarthritis; Osteoporosis; Stroke Rehabilitation; Tendonitis; Post Surgical Rehabilitation; General Weakness; and Circulatory Concerns. The Hand Master Plus includes two black grips of different resistances to exercise with.