Arc-Shaped Newton'S Cradle Balance Ball Science Puzzle Fun Desk Toy Funny Toys Games 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: Original box: Yes . Color:Claret-red Base& Silver Frame . Size: 178x110x145 mm(LxWxH) . Weight: 162g . Quantity:1 . Package included : 1 x Newton's Balance Ball