Yes4All Rubber Egg Shaped Hand Therapy Exercise Ball Kit Strengthen your grips, hands, fingers, forearms and wrists and release stress, tension and reduce jo Ideal for the hand grip, pinch, finger bend, thumb extend exercises and more Perfect to use in a clinic or at home Comes with pack of 3 (yellow, red, blue) and 4 (yellow, red, blue, green) Only measures 5 cm diameter, lightweight, portable