26 gauge hot-dipped galvanized steel curtain with a baked-on silicone polyester top coat. Roll-formed guides of hot-dipped galvanized steel (16 gauge). Self-lubricating wear strips on curtain prevent metal-to-metal contact and muffle door noise. Curtains are prepainted inside and out to inhibit rust. Hot-dipped, galvanized steel is painted with primer and given a tough oven-baked silicone polyester top coat, to provide the most rust-resistant steel door available. Heavy-duty bottom bar withstands the external elements. Full bulb-type bottom weatherstrip ensures proper fit along irregular floors.