... a grade led Item No.: 868NC Product name:Wrist ball with LED and COUNTER Description:Shell 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 ... will automatically display the highest RPM ever achieved on the ball, once the rotor is in motion however, the mode ...