▲ The Newtons cradle is made of steel material and nylon wire, It is more and will not break easily. It is bright, anti-corrosive and not easy to rust. It can be used for a long time. ▲This is a very interesting decompression newton ball. It is very suitable for decoration in offices, homes and other indoor places. ▲ Stress relief desk toy is a very funny decompression toy that a ball can be used to hit other balls and swing. ▲ Not only demonstrates a pendulum, but also shows the Laws about conservation of Momentum and Energy. The device demonstrates Newton's conservation of momentum and energy through a series of rotating spheres of the same size. When a ball at the end is lifted and released, the resultant force passes through the line and pushes the last ball outward. ▲ Balance ball desk toy is a funny gift to your friends, family and children. It can explain your child's physical knowledge and Newton's story, and it can also help you explore the mysteries of natural science. The Newton's cradle is a great invention for both kids and adults,intellectual and elegant decoration for your room and office.