Stainless steel materials, environmental protection and pollution to ensure the health of your family.Material: stainless steel frame + wooden base + steel ball + nylon threadThe benefits of giving gifts to colleagues and friends mean that good relationships double.Suitable for: home, bedroom, TV cabinet, office, school, anniversary or birthday is the best product.The Newtonian pendulum is based on the principle of conservation of momentum and the law of conservation of energy in physics. Under normal circumstances, the swing time is 15 seconds. Because the pendulum force is different in the environment, each swing time will be different.Dimension: 160*90*115mmUsage: Desk Toy, Home DecorationCOLOR: Black/WhiteMaterial: PP + ironPackage Contents:1* DecorationOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.