... strength of fingers ,wrist ,hand fitness and health suitable for children and old people Parameter materialpppackagecolor boxctn/quantity43*39* ... wrists, hands, forearms, biceps, triceps, ligament and shoulders.3,Great benefit for musicians, guitarists, pianists, drummers.4.Rehabilitates sore ... revolutions during a session and record, each 100 rotations as one unit, for example 8650 revolutions will ...