Baking professionals know that the secret to evenly baked and perfectly browned food is to cook it on aluminum bakeware. Aluminum is widely known for its excellent heat conductivity and cooks more evenly and thoroughly than other metals. Compatible with parchment paper or silicone baking mats if desired. Easy clean up; hand wash recommended. Each pan exterior dimensions 12.9 x 9.6 x 1.1 inches and interior dimensions 12.1 x 8.8 x 1.1 inches. Aluminum is reactive to acidic ingredients such as vinegar and tomato products. These foods may darken, pit or corrode the pan after prolonged use. Made in America of domestic and imported materials. Our aluminum bakeware-quality pieces are made to withstand a lifetime of use in your home kitchen.