1) The product with five ply, include two ply Finger joint board and three ply middle Poplar veneer. 2) Basal plates: All the finger joint board are of Fir wood and make from machine joint with high strength. 3) Appearance: Both sides with sanding and smooth, with little defects. 4) No need to be painted, reducing environmental contamination 5) Moisture and deformation resistant 6) Uses: maily as the door&windows frame.