The Cando Digi-Flex progresive system of hand exercisers are designed to help develop the muscles, ligaments, and joints of the finger, hand, and forearm. Eight different progressive resistance levels are available ranging from xx-light (0.75 lbs per finger) to xxx-heavy (13 lbs per finger), providing the most extensive range in the industry. The Cando brand of hand exercisers are used by musicians, golfers, rock climbers, football, basketball, baseball, and are also used in rehabilitation after injury. As an occupational therapy aid, they are used to help develop and increase muscle coordination. Recommended by physicians, personal trainers, occupational and physical therapists, and athletes world-wide. Ideal for guitar, piano, string, and other music players due to isolation of individual fingers, allowing strength to be uniformly developed in the hand.