They are not the same size as Duplos. We have another marble barrel set that fits our troughs and has many uses. I bought this for fun but it's a bit smaller and can't be used with anything else we have. So that was disappointing. The set itself was easy and quick to assemble, but the pieces were flimsy and flimsy, and it collapsed at the slightest touch. My boys loved playing with it all day but it didn't have the durability I want in a toy and they didn't go back on it.
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