Chinese Baoding Healthy Balls stimulate and exercise your hands muscles by moving both of them in one hand. The balls are metal, brilliant painting and design, hollow and have chiming sounding plates inside. They make crisp and rhythmical sounds when moving.Play them to relax and reduce stress. Beautiful silk covered box and instructions included. Additional Details ------------------------------ Bullet point: BEAUTIFUL AND TRADITIONAL: Massage balls have a long history in Chinese culture, they originated in the Chinese city of Baoding during the Ming Dynasty and are still used to this day. These massage balls are a modern replication and feature an elegant traditional Chinese painting of yinyang symbols Product description: Chinese Baoding Healthy Balls stimulate and exercise your hands muscles by moving both of them in one hand. The balls are metal, brilliant painting and design, hollow and have chiming sounding plates inside. They make crisp and rhythmical sounds when moving.Play them to relax and reduce stress. Beautiful silk covered box and instructions included.