... : 6pcs a grade LED Item No.:868N Product naem:Wrist ball with LED Description:Sheel material: A GRADE PCRoller material: Zinc-alloy ... for sports like golf,tennis,squash,cricket,baseball,bowling,basket ball,motocross,mountain climbing.-Increase strength in fingers, wrists,hands,forearms ... children under 12 are supervised by an adult.-Keep the inner parts of the abll clean and avoid any oil contamination ...