✔Gyro ball that has a mechanism allowing you to rotate your hand to increase the revolutions per minute (RPM) of the gyroscope itself. It is a quick and effective way to strengthen your grips,wrists,and forearms.And the counter on the gyro ball will help you build plan and exercise your hand more scientifically.✔Effectively relieve the musculoskeletal pain and arthritis caused by long-term use of wrists and arms, also can help fitness enthusiasts carry out targeted strength training.✔Specification1.Name: Self-luminous wrist ball2.Shell: metal3.Contains: wrist force ball (Not including other things)4.Uses: exercise wrist strength, relax decompression, relieve fatigue✔How to use:1. Push the thumbs of both hands in the direction of the arrow of the center of the ball until the resistance is large and the center of the ball cannot roll.2. Quickly release the core of the ball with the thumbs of both hands, and turn the ball by the hand3. After feeling the sphere rotates, swing the ball from left to right in a circle-like way to slowly rotate the wrist ball, and the speed can be increased with the inertia✔Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. ✔ Service:1. If you need more styles, please click our other products to find the style you want.2. If you have any questions before or after your purchase, please do not hesitate to contact us.