They are almost indistinguishable from Duplo Legos. The plastic is a little thinner, but that's not noticeable. They go perfectly with Lego and are a nice addition. Excellent value for money as Duplos are very expensive. The Duplo Legos are printed with pictures - you need to put stickers on them and attach the wheels to the parts of the train. Stickers do not match the size of the blocks (too large or irregularly shaped). Maybe the sets are not identical (mine was different from the pictures in the instructions). So maybe the blocks are more random? Attached picture of what was included in my set. We were also shorted for several blocks. The set is advertised as having 214 pieces. Even if you include the wheels in the train (extra 8 pieces), we still got about ten pieces off of them. It also does not come with the platform pictured.
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