The fireproof filing cabinet features heavy duty steel construction and it has all Gypsum insulation that's housed in a lattice of 14-gauge galvanized welded steel. Made in the USA, this cabinet 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 available in different sizes, colors, and it's guaranteed by a limited lifetime warranty.