MMI DOOR Majestic Steel entry doors are an intricate part of home design. All of our Majestic Steel doors are galvanized to resist rust and corrosion and are comprised of 24-Gauge, high-quality steel with 22-Gauge steel stiles and rails for additional strength and security. These steel doors come with a one-piece, high-density polystyrene core delivering excellent insulation allowing it to meet or exceed current energy code standards.