... 6pcs a grade LED Item No.:868N Product naem:Wrist ball with LED Description:Sheel material: A GRADE PCRoller material: ... of rotation can reach over 12000 R.P.MFUNCTION:-Perfect exercise gadget for sports like golf,tennis,squash,cricket,baseball,bowling ... ,basket ball,motocross,mountain climbing.-Increase strength in fingers, wrists,hands, ...