hot-dip galvanized steel ceiling system. Thickness: 0.3mm-2.5mm Zinc coating: G40, G60, G90 hot-dip galvanized steel ceiling system. Thickness: 0.3mm-2.5mm Zinc coating: G40, G60, G90 When you purchase from us, please tell us your endusage and your requirement for steel grade or design service. Thanks! Metal Ceiling System