PRODUCT CONTAINS Wrist gyro ball, brand card, ball sleeve, safety rope, gift box. GOOD FOR HEALTH Using wrist gyro balls for exercise can alleviate problems such as wrist soreness and finger stiffness caused by prolonged fixed hand movements, and can also promote blood circulation. An interesting palm wrist gyro ball that can be used as a stress relieving toy, played at any time, and can also exercise arm muscles. EASY TO USE Newly upgraded products that automatically starts without the need for a rope, making it easy to use. Simply rotate the core ball to start. BATTERY FREE DESIGN Precision mechanical design, no battery required to provide power.