Newtons Cradle Steel Balance Bike Fun Physics Science Development Educational Desk Toy Gift Features: 100% Brand New and High Quality. Not only demonstrates a pendulum, but also shows the Laws of Conservation of Energy. Friction and damping effects are also observed. Easy and convenient to use.Often used as a toy to amuse people. This is the perfect desk toy to impress Colleagues and clients alike! It is also great for those enthusiastic about science or to demonstrate the laws of physics in science classrooms. Great gift for everyone. Specification: Quantity:1pcs. Product Material: metal Size：B:13.5x13.5x11.5CM/5.3x5.3x4.5IN Package Include: 1 x Physics Science Toy Note: Please allow slight measurement deviations due to manual measurement. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed in the pictures.