Cheap wood. Do they make lumber cheaper than pine board? If yes, then that's it. Very easy. They send you two sets of screws - short ones to attach the plate to the brackets and long ones to attach the brackets to the wall. short screws are longer than the thickness of the panel. The brackets are made in such a way that it's almost impossible to fit a second screw in for support if you want it under the shelf (and the first one on the wider end isn't that easy either). The best way to mount them is with the brace bracket on the widest side, but then you lose a lot of shelf space with the brace on top. I don't recommend at all.
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