The fireproof 4 drawer file cabinet is made from heavy-duty steel and has Gypsum insulation that is secured in a framework 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, colors, and it's guaranteed by a limited lifetime warranty.