Mostly very thick cardboard. Stronger than corrugated board, but not MDF. But what is it for? It is in order. I stacked 3 of these together to make laptop shelves (see image) with an MDF base to support the lower tier to hold larger items. Works well. I put a 27 inch monitor on top for a minute but changed my mind. It just doesn't feel like it could support that much weight. And I absolutely do not want anything to crash into laptops. I also drilled holes on the side of two of them, to pass the USB cable through. Wading through the back holes every day just doesn't make sense. The holes are quite rough as it is a paper based material. I'm thinking about covering the cut surface with glue to harden it after figuring out the final shape. Will I buy them again? Hm. can be. If they are cheaper, of course. If they are made of wood or bamboo, of course. Since this is the case, the application is limited. Updates... a few months later... As you can see from the new drawing, they are starting to warp. The heaviest is the middle one, where the laptop generates the most heat (Dell XPS 15). In addition to wrapping, double-sided tape begins to lose strength. When I pick them up, some of the backs fall out. But the main reason I pull them out is because Windows on the laptop hibernates due to "thermal" events. Yes, laptops overheat because those paper shelves are basically thermal blankets. At the end of the working day they are very warm. Well, good concept. They end up in the trash!
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