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Its simply a code to tell what kind of plywood it is, "A" is the face grade, (the best side) "C" is the back side, "X" is the kind of glue used to laminate the ply's together, (X meaning exterior grade glue). Codes in wood quality: A being the best, B being of medium quality, and C being the poorest grade.

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17y ago

What else can I help you with?