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Description:Material: Metal Ball & Shelf + ABS Base + Fishing LineColor: SilverSize: (L)X(W)X(H)18X11.5X18.5cm/7.09''X4.53''X7.28''(appr.)FeaturesBrand New and high quality.Newton's Cradle makes a great desktop gift.These swinging balls will keep you occupied for hours at work.Unique exclusive contemporary design complements any office or home decor.Newton's Cradle is a clever device that not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy.