Newtons Cradle LED Light Up Kinetic Energy Home Office Science Toys Home Decor Features: 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. Friction and damping effects are also observed Not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy 100% brand new and high quality. Size:15*15*12cm. Product Description: Includes steel balls, plastic frames