Small Newton's Cradle
Size: 4 inches X 4 inches X 3 inches
Newton's Cradle is also known as balance balls. Pull and drop one or more of the balls on one side, and the same number of balls will swing up on the opposite side. Size: 4 inches X 4 inches X 3 inches
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{"Package Dimensions": "2.9 x 2.8 x 2.6 inches", "Item Weight": "1.6 ounces", "Date First Available": "December 16, 2011"}