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 PendulumMaterial:Metal,WoodSize:S: 15cmx14cmx12cm/5.91inx5.51inx4.72inL: 18.2cmx18cmx11.8cm/7.17inx7.09inx4.65inNotes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 X Newton Pendulum