Baoding balls, also commonly known as Chinese Exercise Balls, Chinese Therapy Balls, Chinese Stress Balls, and Chinese Health Balls are believed to have originated in Baoding, China, a small town in the Heibei province, during the reign of the Ming Dynasty. In Baoding, the balls were once dubbed Chinese Iron Balls, since at first the Baoding balls were made from iron.
Nowadays, Baoding balls are made from many kinds of materials yet remain light to carry. They are usually hollow and made from chrome-plated steel, with most containing a chime within as well. People sometimes call these chime balls or harmony balls. You will find that Baoding Balls can come with many designs crafted onto them. These cloisonne balls usually have hand made designs which depict symbols or characters related to harmony, health, and other positive forces.
Baoding balls are usually used for exercise and meditation, but are also good when employed for medical reasons.