Strengthen your hands, arms, wrists, and forearms with this professional ProSource hand gripper. It is very simple to use and it utilizes a time-proven method for developing greater strength in your hand grip. Choose from six different strength levels. Start of with a lower level and once you feel you have accomplished it, go ahead and use the higher strength ones. It is perfect training tool to use for a variety of sports including weight lifting, wrestling, golf, tennis, baseball, football, climbing, gymnastics, arm-wrestling, cross fit, etc.