Steel. UL classified for fire endurent (1-hour at 1700°F/972°C). 3 large 1-inch bolts (60% bigger than traditional safes). ETL verified to withstand a 15-foot/4.5-meter drop during a fire and stay closed. ETL verified water protection up to 5 inches for 24 hours. Dual digital lock with backlit keypad and tubular key lock. Interior lighting. Bolt-down hardware included. Int.: 12.6 x 11.5 x 9.6 in. H. 78.6 lb. Black.