Commercial Quality Square Cake Pans are constructed of heavy-duty 14 gauge Aluminum and carry a lifetime warranty against rusting, warping, flaking, or chipping. All of our bakeware features a uniform wall thickness resulting in a level rise and an even golden finish on your baked goods. Each Square pan features perfectly straight sides and 90 degree corners to make sure that your cake come out fabulous every time. The square corners are essential for professional results. Made In the USA !