Description: 【Square Newton Balls】: Classic desk toy for children and adults, suitable for psychology, teaching tools, and furniture. 【Newton Billiard Balls】: It has more than a dozen ways to play. You can dial balls in different positions, or you can dial a certain number of balls at the same time. Use your imagination to new ways of playing. 【High Quality Material】: Newton pendulum ball is made of high quality metal frame, plastic base, and metal ball, the thickened base keeps the ball stable when swinging. 【Multipurpose】: Newton's cradle balance balls, decorative ornaments, physical models, gifts for friends and family. 【Home Decoration】: Energy conservation physical model, simple and elegant lines, classic shape, very suitable for offices, study rooms, bedrooms, living rooms, and other places. Specification: Material: Metal Frame and Plastic Base and Metal Ball Product Size: 19cmx19cmx12cm/7.48inchx7.48inchx4.72inch Package Includes: 1 Square Newton Ball  Note: Please allow slightly errors due to manual measurement and different monitors.