Hand Grip Strengthener: Our Gyroscope Wrist Ball stimulates the interaction between the rotation of the wrist and the internal rotating core to promote blood circulation, and restore & strengthen fingers, forearm, shoulders, and ligaments For Fast & Effective Injury Prevention: Perform effective and short exercises at a good quality speed. This mechanical structure power ball can prevent carpal tunnel syndrome, RSI (repetitive strain injury), tennis elbow, neck, and shoulder Vibration Free & Shatter-Proof: No annoying vibration is created by using our power ball exerciser, thanks to the precise rotation. The break resistance and stability are maintained by the robust stainless steel and sturdy plastic housing Comfortable & Easy to Use: Expect faster speed, a brighter light, and more intense training with this hand & wrist exerciser. With its innovative automatic start system, just simply turn, tighten, let go and exercise. You can pace the speed according to your needs Wide Application: You can take this hand exerciser fitness ball with you anywhere and at any time. It is suitable for a ball game, wrist training, dumbbells, muscle, and much more. Best for upper and forearm as well as shoulders, hand, and chest