3 layers of packing ! Inside is craft paper , middle is waterproof plastic film and outside GI steel sheet to be covered by steel strips with lock. effect bolts hat 0.3mm verse tile 32 gauge concealed 0.12-2mm material price decorative manufacture corrugated sheets RAL 9029 0.45mm roofing sheet PPGI HDG/GI/SECC DX51 Zinc Coated Cold Roll for exporting metal roofing sheets prices