We provide quality products and good service.Features:Newton's Cradle makes a great desktop gift.Newton's Cradle is a clever device that 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:Color:Claret-red Base& Silver FrameSize: 178x110x145 mm(LxWxH)Package Includes:1 x Newton's Cradle Balance Balls Desk ToyEmbrace life， embrace shopping.