Features: Weight: 95g Base size: 8.8*7.5*1.2cm 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. Included: 1 x Newton's Cradle Balance Balls Desk Toy