Sur La Table Platinum Professional Half Sheet Pan 21050HS, 17.25" x 12.25" our commercial-quality jellyroll pan meets the highest standards for performance and durability Each piece in this set is constructed with the same features found in the best pans in the industry Thick aluminized steel offers superior heat transfer, corrosion and rust resistance, and excellent durability Each pans thickness is based on years of performance data to deliver perfectly even heat distribution and a lifetime of use Steel wire is added to pan rims for extra strength and resistance to warping