The Regal™ Charcoal Offset body is constructed from 2mm / 14 gauge steel with 800 sq. in. (Regal™ Charcoal 500) or 675 sq. in. (Regal™ Charcoal 400) primary cooking surface, heavy duty cast iron cooking grids. Air vent system includes a chimney-style stack with Roto-Draft™ damper technology. Also features dual-purpose smoke diffusing charcoal trays and a removable ash tray in both cooking chambers.