The large file cabinet is made from heavy-gauge steel and it has Gypsum insulation that's reinforced by a lattice of welded steel wire. It has a 1-hour class 350 fire rating, 30 ft. UL impact rating, and a 30 minute ETL fire rating for digital media. It's also water resistant and it comes with a high security key lock. It's available in different sizes, colors, and it's backed by a limited lifetime warranty.