... : 6pcs a grade LED Item No.:868N Product naem:Wrist ball with LED Description:Sheel material: A GRADE PCRoller material: Zinc ... exercise gadget for sports like golf,tennis,squash,cricket,baseball,bowling,basket ball,motocross,mountain climbing.-Increase strength in fingers, wrists,hands ... sore muscles and joints.GENERAL PRECAUTIONS:-Do not drop the ball on hard surface at any time , the heavy rotor ...