These Chinese Health Balls Red with Yin Yang Design come in Small Medium and Large Size. Balls come in a decorative box that may be Red, Blue, Green, Violet, or Black. Health balls are often used to relieve stress by rotating the balls around in your hand. These balls have a small bell inside of them which chimes when the balls are shaken. ***Box Colors May Vary.*** Comes with 2 Matching Balls and a Box. ***