Made of 100% aluminum, this set of half-sheet baking pans is an indispensable addition to your cooking repertoire. The pans offer superior heat conductivity for even browning and are constructed with encapsulated steel rims for extra durability. Designed for a lifetime of performance, these premium sheets are naturally resistant to rust and will maintain their quality and appearance for years.Nordic Ware, a family-owned and -operated company, has been making high-quality bakeware for over 75 years.