Features: 100% Brand New and High Quality Not only demonstrates a pendulum but also shows the Laws of Conservation of Momentum and Energy. Friction and damping effects are also observed. Often used as a toy to amuse people. Includes steel balls plastic frames and base. Great gift for everyone. Specifications: Size: 87x75x95mm(LxWxH) Net weight:96g Color:Wine red+Silver Packing content: 1 x Balance Balls Desk Physics Science Pendulum Desk Toy