DESCRIPTION: Better Package for Protecting Strings: We have improve our package for newtons cradle balls, you will never have to worry about the strings being tangled when your receive it. Great Gift for Kids: All kids dream of being scientist, how should we help our child? Let's start from newtons cradle balance balls and give the dream to your child. Material: The magnetic balance ball are steel, quite heavy with shiny plating and securely mounted. As a Decoration: The desk pendulum balls can be as an exquisite decoration that can be placed in house,school or office. Have Fun: A balance ball toy that will keep you entertained throughout the day. FEATURES: Not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy Pioneering developments for several years, we have been focusing on the exquisite technologies and physics tools. This classic desktop toy provides you many benefits and entertainments, is suitable for various locations such as house or office, and is an intriguing device that not only demonstrates pendulum motion, but also helps to show the laws of Conservation of Momentum and Energy. Whether you are studying physics knowledge, working on complex analysis, or looking for a delicate gift, this goods is definitely what you really want ATTENTION: When you received the item,please take the balls out one by one，or the balls may be tangle up Friction and damping effects are inevitable Please place the Newton's Cradle horizontally, and then the balls can move longer
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