Nordic Ware's line of Natural Commercial Bakeware is designed for commercial use, and exceeds expectations in the home. The durable, natural aluminum construction bakes evenly and browns uniformly, while the light color prevents overbrowning. The oversized edge also makes getting these pans in and out of the oven a cinch. Proudly made in the USA by Nordic Ware. Aluminum is reactive to acidic ingredients such as vinegar and tomato products. These foods may darken, pit or corrode the pan after prolonged use.