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SAFE MATERIAL :Balance balls friction and damping effects are also observed . material ,balance balls toy made of stainless steel material ,anti rusty ,safe and smooth to touch . SAFE MATERIAL :Balance balls friction and damping effects are also observed . material ,balance balls toy made of stainless steel material ,anti rusty ,safe and smooth to touch . EXCELLENT DESIGN :Toy Newton's balance balls excellent educational science gadget .Not only demonstrates a pendulum ,but also shows the laws of conservation of momentum and energy . SCIENCE TOY :When feeling tired of studying and working ,you can stir balls to hear the clinking sound to ease . Excellent educational science gadget ,own your very own piece of scientific history and explore significant values of physics . MULTIPLE FUNCTION :Science balance balls excellent educational & science gadget ,own your very own piece of scientific history and explore significant values of physics . As an educational toy to improve your childrens study about perpetual motions ., Manufacturer: Raguso