Chicago Metallic Professional Bakeware features heavy weight aluminized steel which provides durability and excellent heat conduction with the corrosion-resistance of aluminum/steel alloy. Our products feature Ifalon Resist Non-stick finish that won't chip or peel, withstands temperatures up to 550°F and is 10 times tougher than ordinary non-sticks. Folded corners add triple-thickness strength, reinforced rims eliminate warping in the oven.