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Description: Perpetual motion, a piece of magnetic revolving art craft gadget for your desk office. Powered by 4pcs AA batteries，push the device slightly, it will keep going and going on rocking round until you stop it or power off. Kids educational physics science toy，the principles of Conservation of Momentum and Energy. Great artworks for home or office desktop ornaments, also birthday gift christmas gift for your children. Material: Metal, Plastic Specification: Color: Multicolored Base Size Diameter: 11 cm / 4.33 inch; Height: 3 cm / 0.12 inch Celestial Body Size Height: 5 cm / 1.97 inch; Width: 5 cm / 1.97 inch Package Includes: 1 Set Perpetual Motion Toy (Batteries are not included) Note: Due to the manual measurement, please allow 1-3mm differences in size