Feature: 100% brand new and high quality. Quantity:1pcs. Material: metal and plastic. Color: silver 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 Size9x 7.5x 9cm. Net Weight: Approx 85g. Easy and convenient to use.Package Include:1 x Balance Balls Desk Physics Science Pendulum Desk Toy.