With the Gripmaster Pro hand strengthener you can excercise each finger individually or give your entire hand a workout. Extra-heavy spring tension is intended for motivated individuals who require extreme and extraordinary grasping power recommended for people with stronger-than-average hands. Features individual spring-loaded buttons for each finger extra-heavy spring tension provides 11 lbs. of resistance per finger. Pocket-size gym strengthens fingers, hands, wrists and forearms. Ergonomic palm bar adds to comfort. Fits both left and right hand.