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Desk toys rotating swing balance ball perpetual motion educational toys, it is not only a birthday gift or Christmas gift for your children, but also a great art for home and office accessories. Parameter: Material: metal + plastic Size: about 19*10. 8cm/7. 48*4. 25in Weight: about 250g Function: Desk Toys - Rotating swing balance ball perpetual motion educational toys Children's educational physical science toys show the principles of conservation of momentum and energy. It also has more uses waiting for you to discover, such as increasing the number of steps, cell phone holders, etc. Battery: 4 A A batteries (supplied), or U S B connection power. If you have any dissatisfaction or doubt about our products, please contact us through the buyer's news in the first time, and we will give you a satisfactory solution within 24 hours.
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