This Grip Trainer strengthens your hands, fingers, and wrists. A good choice for athletes (climbing enthusiasts, fitness, tennis, baseball, boxing, tennis, golf, and shooting) and musicians (guitarists, bassists, pianists, and violinists). It can also be used by computer users. Perfect for improving power and flexibility of forearm, wrists, fingers, hand ,and muscle building. Excellent for recovery of hand injury, rheumatoid arthritis, arthritis, carpal tunnel, tendovaginitis, fractured, broken wrist, and tendon surgery. This hand strengthener can record your exerciser number every time you use it.