With the Gripmaster, you can excercise each finger individually or give your entire hand a workout. Pocket size gym strengthens fingers, hands, wrists and forearms. Individual spring-loaded buttons for each finger. Ergonomic palm bar adds to comfort. Fits both left and right hand. Models are color-coded for tension settings-Blue - 5 pounds per finger, Red - 7 pounds per finger, Black - 9 pounds per finger.