The see-saw is our largest expansion-element currently. If the marble has enough momentum it will go straight up the see-saw and continue afterwards with increasing speed. And because you can never have enough see-saws, this set includes two, furthermore base plates, run elements, building blocks and marbles. Hubelino's robust marble runs are designed to stay put, so your kids can focus on the fun. They promote spatial intelligence and an understanding of fundamental physical concepts like acceleration and gravity.
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