The fireproof file cabinet is part of the Classic Series by FireKing. It's made from heavy-gauge steel and it has Gypsum insulation that is encased in an internal grid 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's available in different sizes with your choice of color. Quality guaranteed by a limited lifetime warranty.