Welcome to our shop! Newtonpenduel are classic desk toys; It is also known as Ball Game, Newtons Cradle, Newton Cradle, Perpetuum Mobile. Height: 180mm, weight: over 0.8kg, trendy, modern design, handcrafted gift. Newtons Cradle is a timeless classic desktop science "toy" that is the perfect blend of science and art , suitable for children to experience the fun of mechanics while playing this fun device. If one of the outer stainless steel balls in the metal frame is knocked against the others, the central balls apparently remain stationary . Only the ball at the other end of the chain pushes back. With 2 swinging balls, the center ball stays upright, the opposite two swing. Versatile. You can use it as a physical device, office equipment, stress killer, and also a nice gift and desktop decoration, nice gift for friend. Due to manual measurement, the products you receive may have some dimensional errors Due to different monitors, the products you receive may be slightly different from the pictures Actual delivery quantity: 1 piece 100% satisfaction - Our customers are our priority. If you find any problems with the products after receiving the goods, such as damage and incorrect quantity, please contact us immediately. We do our best to provide you with satisfactory after-sales service.