Here is a Chinese Healthy Ball Massage Set.  These balls are said to have a great healing therapy on your nerves and are great for muscle tone in your hands wrists and forearms.  Works great to help relieve pain from carpal tunnel and tendonitis.  As you rotate the balls in your hand, they chime and relax you. The balls are metal, hollow and have chiming sounding plates inside. Play them to relax and reduce stress. Beautiful silk covered box and instructions included.