Works as a hand therapy ball (light and medium tensions) for increasing strength and range of movement. Perfect for late stage exercise rehabilitation of all finger, thumb, hand, wrist, carpal tunnel, forearm & elbow conditions and it is your super-easy hand strength training. Exercises the frequently ignored extensor muscles to guard against and help relieve the symptoms of carpal tunnel, arthritis and repetitive strain injury. Provides basic grip training for rehabbing hands. A grip strengthener that properly addresses the kinetic chain of grip, A powerful & easy-to-use exercise therapy & rehabilitation device, A market-changing proactive ergonomic exercise. Makes performance training, hand muscle strengthening and general wellness simple. If you use your hands to grip or grasp in sport, musical pursuit, workplace or hobby, hand muscle imbalance is a given, not a maybe and your health & performance is at risk. Performance and balance solution in: Sports, Music, Workplace Ergonomics, Computers, Smart phone& Video Games ,Hobby