American made: All Nordic Ware bakeware is proudly made in the USA to exacting standards, with careful attention to detail in the manufacturing process Natural aluminium: Built to last, these baking sheets are made from natural, rustproof aluminium to ensure consistently even baked results for many years to come Better airflow: This eighth sheet baking pan features an exclusive Prism grid for added durability, easy release, and better airflow for more uniform crisping Prevents warping: With encapsulated galvanised steel rims, this cookie sheet prevents rusting and is designed to look fantastic in your kitchen for years ong warranty: We take pride in presenting the very finest products. We are confident in the quality of our sheet pans for baking, and so we supply them with a lifetime warranty