The vertical filing cabinet features heavy-duty steel construction with Gypsum insulation that's reinforced by an internal lattice of galvanized, 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 available in different sizes with your choice of color, Pewter shown. Quality guaranteed by a limited lifetime warranty.