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A, B, C, and D are the four grades of plywood. Plywood’s grade refers to its veneer quality and appearance. Among the three, A is the best quality and most expensive, while D is the least expensive.
A B-grade sheet of plywood is another almost perfect option. The surface of B-grade plywood is mostly smooth and the foundation is solid. This plywood might have had some repairs made, but a B-grade would have only small flaws.