Description: 100% Brand New and High quality. Smart gravity sensor can be used to feel the centrifugal force and to strengthen your limbs coordination or rehabilitation training. Compact size can be put in your bags to do outdoor activities. Simple operation can be powered on quickly by rotating your wrist to make fast speed. Stylish look with a quiet sound can be a great gift. Specification: Material:Polycarbonate, Zinc Alloy. Start: Auto Start. Color:Black,Silver. Age Recommend:＞12 year old. Size:7.2*5.6cm. Quantity:1Pc. Warning: Not suitable for children under 12 years. For use under adult supervision. Note: 1. Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. 2. The colors may be different as the difference display. Please understand. Be sure that do not touch the ball body when it is at high-speed revolving. 3. Keep clean inside of ball and avoid any minor articles. 4.Keep away from moist and watered places. 5. As it is precisely produced, never fall on hard surface. Package Included: 1 x Wrist Ball. 1 x Rope. Please kindly Note: Items will be repackaged to save your shipping charge & to be environmentally friendly. We guaranty the item will be protected well in bubble bags, No retail box!