39" Stainless Steel Round Disc, Stainless Steel 31" Burning Spur, TPSI Ignition with Spark Ignition, for Natural Gas - 150K BTU Thermocouple Piloted System with Safety Valve turns gas off when loss of flame Easy ignition with Battery Spark Igniter (included) TPSI system with Safety Valve turn gas off when pilot flame goes out Robust ignition system with full BTU throughput Burner Pan Material:Stainless Steel Caution:DO NOT USE REGULAR STONE OR ROCK due to susceptibility of explosion.