Features: Great educational physics science toy to help kids understand the principles of conservation of momentum and energy in a easy way. Powered by 4pcs AA batteries, move lightly, it will keep going on rocking around until you stop it or power off. (Batteries are not included) Unique semi-globe frame and stylish design, perfect for home and office decoration. Perfect gift for your children, friends or coworkers. Made of high quality metal and plastic material, tough and durable to use. Specification: Material: Metal + Plastic Color: As picture Battery: 4pcs 1.5V AA batteries(Not included) Size: 19.5*16*10cm / 7.7*2.5*3.9 inch(Approx.) Package list: 1 * Revolving Gadget Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures. Package List 1Great educational physics science toy to help kids understand the principles of conservation of momentum and energy in a easy way. 2Powered by 4pcs AA batteries, move lightly, it will keep going on rocking around until you stop it or power off. (Batteries are not included) 3Unique semi-globe frame and stylish design, perfect for home and office decoration. 4Perfect gift for your children, friends or coworkers. 5Made of high quality metal and plastic material, tough and durable to use.