Monessen Gas Logs 18 Inch Mountain Oak Vent Free Natural Gas Log Set With Manual Safety Pilot Includes: Double yellow flame burner system, Heavy grate assembly, Volcanic rock 18" EYF Burner Natural Gas 28,000 BTU, Natural Gas. 18" Refractory Cement Logs Monessen Gas Logs 18 Inch Mountain Oak Vent Free Natural Gas Log Set With Manual Safety Pilot Manual Safety Pilot - Manually Controlled