A science cradle balance ball based on Newton's law. 5 solid ball and fine fish line material, ensure the durability Made of high quality wooden base, which is natural and eco-friendly Suitable for psychology, teaching tools and furnishings, a nice gift for your kid, let them experience the fun of mechanics in the process of playing this fun gadget Watching the back and forth movement of the balance ball, gives you a day-to-day soothing experience Swing time: The balance balls continue in perpetual motion for only 15-25 seconds due to the resistance of the air and friction, but it won't influence the effect of playing although it can not the seamless convergence among balls in the vacuum
EAN: 7652188813755
Manufacturer: 753
Brand: 753
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