Product Feature: 1 Fire-proof,Moisture-proof 2 Anti-corrosion 3 High strength 4 Energy saving, light weigth Product Description: 1 Material: Steel,alumininum, glass steel etc 2 Features: Fire-proof,Moisture-proof,anti-corrosion,high strength,energy saving, light weigth and good heat dispersion etc. 3 Shape: straight,tee,cross-way, Z, L,tray, ladder and arc type etc. Plywood case.