Surface material: fireproof board, after mothproof anti-corrosion treatment. The substrate: in line with the national standard "Fu" or "orthodox" brand of environmental protection type density board, various physical and chemical performance index have reached the international standard. By five at the end of three grinding back process. Hardware: Sino foreign joint venture "Bo Gwis" three guide after 50 thousand, the closed test can still be used normally: Sino foreign joint venture "Ludwig" hinge, Sino foreign joint venture "Yong Yang" brand front lock.