a) Grade: BB. b) Material: Russia Camphor pine, c) Two sides sanding with smooth surface and in high strength.The board can avoid wood bending well. d) Moisture content: 8%-12%. e) Little chromatism, small healthy knot(<30mm), small black knot(<5mm)are allowed. No oleoresin, scar, split, moldering, wormhole, damage, blue stain, or wave in the surface.