JIN BD Wrist Trainer Ball Auto-Start Strengthener Gyroscopic Forearm Exerciser Gyro for Strengthen Arms, Fingers, Bones and Muscles with LED LightBlue

Benefits of the wrist ball 1. Wrist ball is good for warming up your hands, wrists, shoulders, forearms, biceps and upper limbs 2. If you use the computer or play the piano for a long time, you can pl...