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1 4X8 sheet of pressboard - 1/4 in. thick.
1 4X8 sheet of Luan - 1/4 in. thick. (Has small piece cut out of one corner)
These boards got wet and blown around during that terrible thunderstorm a few weeks ago. They seem to be OK, though. Slightly warped from getting wet and then drying in the sun.
I thought I had them in a secure place outside near my garage, but the high winds had other plans for them I guess.
Stop complaining; they're FREE.