Continental CB42 Traditional Propane Gas Millivolt Ignition Direct Vent Gas Fireplace natural gas to propane All our fire beads are OPT FRMPC6015FSEN SLV NG All our fire beads are manufactured using high quality glass via a unique 5 step process that renders them their splendid shine and also allows them to withstand temperatures of up to 1300 degrees Fahrenheit without sustaining any damage or discoloration ) Maximum burn time Continental® products are designed with superior components and materials assembled by trained craftsmen who take great pride in their work receives the quality product that you expect from Continental®