They are fully compatible with my LEGO brand Duplo pipe sets. I expected it with real bumps but not pipe joints. Pipe connections are fully compatible. They actually connect a little easier than my Duplo tubes and hold up quite well. Even my Duplo tubes (a LEGO brand) differ in ease of connection and strength of attachment. They are easier to break because the plastic is lighter for a product of the same size. I like these slides better than the Duplo slides from the LEGO brand because they are a bit wider and otherwise not noticeably inferior in quality. actually lower cost than the LEGO Duplo when you factor in the number of pieces. A LEGO-branded set costs around $1 each, but that doesn't include the pretty container it comes in or the building cards. This set costs about 75 cents each. The biggest advantage of this set compared to the LEGO brand Duplo set is that you can buy a small set.
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