This item only works if you have a large number of Duplo blocks that support building a ball. I didn't know I was buying an expansion pack and in return there was a bust as a gift. My grandkids didn't have Duplo blocks, so they couldn't build a treadmill. In the item description it should actually be clear that you need a large number of Duplo building blocks to build it. The quality of the materials was good.
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