This forge has a FACTORY RIGIDIZED VACUUM FORMED CERAMIC LINER on the top and sides, with the Dense high siliconized Ladle Brick on the bottom. This liner is made specifically for MAJESTIC FORGE to strict specifications. It has a Rigidizer applied at the factory for a hard durable interior surface, the liner is light in weight which makes it easier to move it to where you need to use it. This forge is great for the knife maker or general blacksmithing, and light welding. Complete setup and adjusting instructions included. Orifices have height adjustments for different altitudes, humidity, wind, etc., that can affect the operation of atmospheric forges. It has all UL rated brass orifices, a precision needle valve for burner adjustment, heavy duty adjustable regulator, hose, gauge, and fittings.