Description:1. Make Arm Great Again. Strengthen fingers, wrists, hands, forearms, shoulders, and biceps, etc. It also can be beneficial in promoting coordination and blood circulation.2. This certainly requires some fine motor skills in order to use it. The dominant hand/arm was easily able to keep the gyro ball going, it will help refine you're fine motor skills in that non-dominant hand/arm.3. Small, compact, and transportable, you can take it anywhere. The unit did not have any weird vibration to it. Also having the silicone grip section is very nice as it helps with the gyroball not coming loose from your hand. You can attach it to a wrist strap if you are really concerned about the gyroball flying away.PackageIncluded:1 x Wrist Ball with lightsNotes:- Due to the light and screen setting difference, the color may be slightly different from the pictures.- Please allow slight dimension differences due to manual measurement.