Lightahead Classic Newton Cradle Balance Balls Kinetic Art Balancing Toy in Perpetual Motion Decoration for Home & Office

Classic Cradle Balance Balls Science Psychology Puzzle Desk Toy. Impact a ball and the balls will impact each other. Exemplifies Newton's principle that, "action and reaction are equal and opposite." Excellent educational & science gadget, own your very own piece of scientific history and explore significant values of physics. It is an amazing product at this price, it can be a great gift to your families or friends. It also can be used for education purpose. Material Plastic and iron