Chinese Exercise Balls Stress Meditation Relaxation The Baoding Iron Ball, famed as one of the "three treasures" of Baoding, China, is a traditional product renowned at home and abroad. Each pair of balls will have one of which produces a high tone and the other a low tone. This iron ball is considered a national treasure because of its ability to enhance the user's heath and well-being. #china #antique #chinese #lunarnewyear #art #vintage