Consult your physician before you start using this device. If you suffer from rheumatoid arthritis, arthritis, carpal tunnel, tendonitis, tennis elbow and are on the way to recovery from a fractured or broken wrist, or tendon surgery, then this is the perfect gripper for you. By isolating each finger, strong fingers can't compensate for the weaker ones. Balanced finger strength helps prevent injuries and muscle imbalances. Strengthening your grip and fingers for better performance with musical instruments, workouts at the gym, rock climbing, or extra "hmph" to open jars.