Roskio Newton's Cradle Balance Ball - Swinging Physics Science Pendulum Balls Desk for Office Physics Teacher Decorations Square Style Mini Small Black,Yellow
100 Percent 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.
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Roskio
{"Package Dimensions": "3.7 x 3.23 x 2.95 inches; 3.84 Ounces", "UPC": "743231666866"}