Magnalite Classic 5-Quart Dutch Oven with Rack Constructed of professional grade, hand-cast aluminum Thick base won't warp Heavy domed lids lock-in moisture, transfer heat from vessel side walls, and help facilitate convection style heating. Constructed of professional grade, hand-cast aluminum Thick base won't warp Heavy domed lids lock-in moisture, transfer heat from vessel side walls, and help facilitate convection style heating. 50 year limited warranty