... of Origin,ISOSurface Treatment:Zinc Azinc galvanized,color coatedFeature:Anti-water,fireproofing,quake resistant,anti-rain, light weight, full hard, colorful good outlook ... treated as galvanized and color coated.so it can anti-rain,anti-fire,anti-quake,So it has a long term life as 20 ... or as your requirement,for easy set up .7. Prime anti-fire application,which is confirmed by GB50222-95 as difficult ...