Chinese therapy balls have long been famed as one of the "there treasures" of Baoding China. First produced during the Ming Dynasty (1368-1644), therapy balls have often been improved through the ages by skilled Chinese handicraftsmen.
Originally, these balls were simple, solid, cylindrical objects, later, handicraftsmen began designing hollow balls and inserting sounding plates that produce high and low tones when used. These lighter balls are easier to handle and the musical tones contribute ti the relaxation process that results from exercising with them.