Newtons Cradle LED Light Up Kinetic Energy Home Office Science Toys Home Decor Feature: 100% brand new and high quality. Quantity:1pcs. Product material: metal bracket + ABS base + solid iron ball Not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy Friction and damping effects are also observed Includes steel balls, plastic frames and base Size: L: 15 x 15 x 12cm S: 12 x 12 x 9cm . Easy and convenient to use. Batteries:4 x AA batteries(Not Included) Glowing Newton ball swing more dazzling at night, the base has a luminous plate, projected onto the glass beads, glass beads showing colorful, very attractive. Package Include: 1 x Newtons Cradle LED Light Up Kinetic Energy Home Office Science Toys Home Decor