of lava rock.
The fire pit also features fiberglass reinforced durable concrete construction and 50 lbs.000 BTU of heat. XOFRND36GR 36" Round Fire Pit with 65000 BTU 304 Stainless Steel Burner and Fiberglass Reinforced Durable Concrete in. This 36 Round Fire Pit from XO comes with a 304 stainless steel burner with up to 65.