Feature: 100% brand new and high quality. Quantity: 1 piece. Product material: plastic, metal Not only shows the pendulum, but also shows the law of conservation of energy Simple and convenient to use. Including steel ball, plastic frame and base Suitable for home decoration, but also the best gift for children Small size: 17.8x11x14cm Medium size: 22x14x18cm Large size: 26.7x16x22.5cmPackage Included: 1 x Balance swing ball ornamentNewtons Cradle Metal Pendulum Steel Balance Ball Pendulum Swing Ball Educational Science Cradle Balance Balls Metal Ball Pendulum Big Newtons Cradle Balance Metal Balls for Office Toys Physics Toys Teacher Toys Steel Ball Toy Classic Newton's Cradle Balance Balls Desk Ornaments SmallNewtons Cradle Metal Pendulum Steel Balance Ball Pendulum Swing Ball Educational Science Cradle Balance Balls Metal Ball Pendulum Big Newtons Cradle Balance Metal Balls for Office Toys Physics Toys Teacher Toys Steel Ball Toy Classic Newton's Cradle Balance Balls Desk Ornaments SmallNewtons Cradle Metal Pendulum Steel Balance Ball Pendulum Swing Ball Educational Science Cradle Balance Balls Metal Ball Pendulum Big Newtons Cradle Balance Metal Balls for Office Toys Physics Toys Teacher Toys Steel Ball Toy Classic Newton's Cradle Balance Balls Desk Ornaments SmallNewtons Cradle Metal Pendulum Steel Balance Ball Pendulum Swing Ball Educational Science Cradle Balance Balls Metal Ball Pendulum Big Newtons Cradle Balance Metal Balls for Office Toys Physics Toy