Description: It is a perfect model for demonstrating the laws of physics to students because of its Newton's cradle design. With fascinating 5 ball motion stress reliever, the product can relieve your stress and provide 3D visual experience. Made of high quality wood and metal.It is durable and waterproof. There are two sizes you can choose from:Small and Large. It is suitable for home decor, office decor, desk decor, etc. Item Name: Newton Pendulum Material:Metal,Wood Size: S: 15cmx14cmx12cm/5.91inx5.51inx4.72in L: 18.2cmx18cmx11.8cm/7.17inx7.09inx4.65in Notes: You will find more amazing products if you visit our store. Due to differences in lighting and screen settings, the color of the project may be slightly different from the picture. Due to different manual measurements,allow for slight size differences. Package Includes: 1 X Newton Pendulum