The large filing cabinet is made from heavy gauge steel and it has Gypsum insulation that is secured in a grid of 1" x 2" galvanized welded steel wire. It's water resistant and has a 1-hour class 350 fire rating, 30 ft. UL impact rating, UL high security key lock, and a 30 minute ETL fire rating for digital media. It's available in different sizes with your choice of color, Arctic White shown. Quality backed by a limited lifetime warranty.