Product 1.Exercise your wrists and hands. The hand enhancement ball is the centrifugal force generated by the interaction betn the rotation of the wrist and the internal rotating core, which can maintain the high-speed rotation of the core, promote blood circulation, and increase the fingers, wrist, hand, forearm, biceps, triceps, and ligaments And the strength of the shoulders, restore muscle strength. 2.Automatically start the design. The operation is very simple, just push the core in the direction of the arrow, which is activated by the internal spring. Please wear a special wristband during exercise to ensure that you will not lose it due to excessive force. 3. Rugged and durable. 4.Easy to use. Mechanical design, no power supply required. The compact design can be carried anywhere, whether in the office, gym or at home, it can be used as a toy to decompress at any time, and it can also exercise arm muscles. 5. Intimate gifts. The stylish appearance and quiet sound , this is a great and loving gift.