They are made of somewhat flexible plastic and the set of 36 I ordered had no cracks or breaks. They arrived well packaged. To bring them together, work on a flat, hard surface, bottom side up - this way you'll see the interlocking edges line up, and a simple push along the edges locks them in place. I found that they bend a little at the edges of the joint once connected, so I laid strips of tape along the bottom of the container to loosen them, making sure they were tight when the tape applied became. It worked great and the finished system is flat and reliable. I would not put filled containers together - just measure the space in the drawer and assemble the organizer to measure.
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