Colored Ball Ferris Wheel Perpetual Motion Instrument No Wobble Celestial Body Model Home Decoration Magnetic Features: 100% brand new and high quality. Easy to use. This is the perfect office toy to impress colleagues and customers! Yongdong desktop toys are very suitable for your outer space theme office or room decoration. This is also a great thing for those who are passionate about science or demonstrate the laws of physics in science classes. A rotation at the top of the base causes the galaxy to move. It's a cool gift for science physics lovers. The battery model requires four AA batteries to work. Batteries are not included. Baby height 22.5cm, diameter 17cm Product Description: Product materials: metal and plastic.