This hand therapy ball set by Fitness-Mad has been designed to help develop muscles and strengthen the forearms, hands, wrists, and fingers as well as increase flexibility and relieve joint pain and stiffness. Ideal for improving performance for weightlifters, climbers, tennis players, and golfers, plus they can be used for improving strength for daily activities. Set of 3 to choose your level from Light (Blue), Medium (Green), or Strong (Grey).