Professional Lifetime Non-stick bakeware comes from Chicago Metallic, longtime suppliers of commercial bakeware. These pans are made of an exclusive aluminum/steel alloy that combines excellent heat conduction with the strength to guard against warping in the oven. The rolled rims and folded corners enhance durability. A dual-process non-stick finish, safe to 550 degrees F, ensures that even the most delicate baked goods will release easily, time after time. This surface will not peel or chip and is dishwasher-safe. 25-year warranty against defects in materials and workmanship.