Perpetual sports tabletop toys are perfect for your outer space theme office or interior. A battery is required (not included). Manufacturered by JUMERY. This is the perfect desktop toy that impresses colleagues customers and friends. Size:10.8*21CMI am very passionate about science or show the laws of physics in science classes. After sale:If you have any questions please contact us and we will try our best to provide you with a satisfactory solution.