Focus Foodservice Commercial Bakeware 23-Gauge Natural Finish Aluminum-Sheet Pan, 1/4-Sheet Heavy duty commercial bakeware; quarter sheet pan 23 gauge natural finish aluminized steel;superior strength,even heat distribution Pan measures 9-1/2 by 13 by 1-inch Concave bottoms flatten during heating; reinforcing rods keep pans straight during baking Season pan prior to first use; hand wash with hot water, mild soap and dry immediately