gadget led Sheel material: A GRADE PC Roller material: Zinc-alloy and a grade ABS LED: 6pcs a grade LED Item No.:868N gadget ledProduct ... naem:Wrist ball with LED Description:Sheel material: A ... rotation can reach over 12000 R.P.MFUNCTION:-Perfect exercise gadget for sports like golf,tennis,squash,cricket,baseball,bowling, ...