There are no spare keys. It is sturdy and fire-resistant, so it won't burn even in a fire. SentrySafe (Master Lock): A leading brand with approximately 80% share of the U.S. fire-resistant safe market. It passes 1-hour to 2-hour fire resistance tests (UL standards) and is widely used for both home and business purposes. In addition to fire resistance, many models also feature waterproof and water-resistant capabilities. Portable fire-resistant and waterproof storage boxes (such as those with tubular keys) are also popular.