Portable and durable cast iron Hibachi charcoal grill. 157 Square inch cooking surface. 3 position adjustable cooking grids. Wood handles for protected moving of grill and grids 2 adjustable air vents for controlling charcoal burn rates. This product was designed for charcoal only. Vent windows are to control the charcoal burn. Cast Iron is formed by making a mold in wet sand with liquid iron is poured into the mold. The sand mold is why the surface is not perfectly smooth.