Perpetual Motion Desk Toy Revolving Balance Balls Physics Science Toy Product description: 100% brand new and high quality. This is the perfect desk toy to impress Colleagues and clients alike Perpetual Motion Desktop Toy is perfect for your outer space themed office or room decor. It is also great for those enthusiastic about science or to demonstrate the laws of physics in science classrooms. A simple spin of the top of the base sets the galaxy in motion.A top seller in the space museum stores and a cool gift for the science physics enthusiast. Quantity:1pcs. Product Material: metal and plastic. Size:23x20cm/9.1x7.9in. Easy and convenient to use. Package Include: 1 x Physics Science Toy Note:The product is not electrified and does not rely on electricity to start.Please allow slight measurement deviations due to manual measurement.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed in the pictures.Products from Chunchuan's store