Baltic Birch Plywood is lightweight multi-ply plywood made entirely of birch plies, using no softwood or filler plies in the center. The result is a product with greater stiffness, strength and durability. Baltic birch is graded as a B-BB, which means that one face, B, will be a whole face, no splices, have no patches (plugs that are used to cover defects) but may contain knot pattern or mineral streaks. The other face, BB, and the inner plies will contain patches and tight and not so tight...