... : 6pcs a grade LED Item No.:868N Product naem:Wrist ball with LED Description:Sheel material: A GRADE PCRoller material: Zinc ... for sports like golf,tennis,squash,cricket,baseball,bowling,basket ball,motocross,mountain climbing.-Increase strength in fingers, wrists,hands,forearms ... heavy rotor will damage.-Do not touch the ball rotor when it is spinning at high speeds,it will burn.-Do not ...