... with LED and COUNTER Description:Shell material: A grade PCRoller material: Zinc-alloy and a grade ABSLED: 6pcs a grade ledTHEORY:It is application ... strength in fingers, wrists,hands,forearms,biceps,triceps,ligament and shoulders.-Great benefit for musicians,guitarists, pianists,drummers.- ... will burn.-Do not use this product persons who with heart conditions of any description.-It is recommended ...