Powerball 280Hz Classic Gyroscope Hand Exerciser (Blue) - Original Hand Trainer Ball for Powerful Grip Strength, Hand & Arm Training and Rehabilitation

SIMPLY WORKS The best products don?t require a lot of fuss, they just work. Wind back the precisely balanced zinc rotor; release and begin turning your wrist in slow, gentle circles. As your Powerball rotor builds speed so does the gyroscopic resistance. This resistance is in the form of isometric exercise for a Powerball user. Perfect for rehab & strengthening from fingertip to shoulder. S...