Feature: 100% brand new and high quality. Quantity:1pcs. Product Material: frosted glass + fishing line + plastic base 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: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.