Musical Balls. Made in the Boading province of China. This comes from an ancient tradition and technique of making. Metal balls with a little metal chime inside that gently vibrates as it rings. Very good for improving finger dexterity. Strengthening your finger muscles and forearms. Calming, relaxing. The vibrations from the ball as it gently vibrates is supposed to stimulate the chi meridians in your palm. Or, if worse comes to worse, excellent weapon to throw at somebody!