The 4 drawer file cabinet features heavy-duty steel construction with 100% Gypsum insulation that is reinforced by a 1" x 2" lattice made of galvanized welded steel. It's water resistant and it 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.