Xshuai Arc-shaped Newton's Cradle Steel Balance Ball Energy Physics Science Puzzle Fun Desk Toys Home Office Decor (A:13*11*17.5cm)

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Colour Name:A:13*11*17.5cm ❤ Feature: ❤ 100% brand new and high quality. ❤ Quantity:1pcs. ❤ Product Material: metal and plastic. ❤ Not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy ❤ Friction and damping effects are also observed ❤ Includes steel balls, plastic frames and base ❤  Size:13*11*17.5cm/22*14*17.5cm/26.5*16*21.5cm. ❤ Easy and convenient to use. ❤ Package Include: ❤ 1 x Arc-shaped Newton's Cradle Balance Ball Science Puzzle Fun Desk Toy