Product Description 1.When your wrist/arm/shoulder is uncomfortable, or you work with computer/mobile phone for a long time, or you don't have time to go to the gym, you can use gravity ball, The above centrifugal force, in turn, increases the strength of the wrist, hand, forearm, biceps, triceps and ligaments. 2. The core has its own light bar, and as the speed increases, different stages will produce different colors. It will be really fun during the workout. 3.Gyro Ball Exerciser is a fun and easy way to exercise. Cool physical self-starting mechanical operation, just hold the ball and rotate it around your fingers, the wrist can feel the power brought by the rotation, the game of force and beauty, and the pressure is released incisively and vividly. 4.GIFTS FOR MEN AND WOMENThis spinner is exquisite in details and feels good in hand, so it can be given as a gift.