Newtons Cradle LED Light Up Kinetic Energy Home Office Science Toys Home DecorFeature: 100% brand new and high quality. Quantity:1pcs. Product Material: frosted glass + fishing line + plastic baseNot only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and EnergyFriction and damping effects are also observedIncludes steel balls, plastic frames and base Size:12*12*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