Naturals bakeware is made of pure aluminum which will never rust for a lifetime of durability. Foods bake and brown evenly due to aluminum???s superior heat conductivity. Reinforced encapsulated steel rim prevents warping and adds strength. Lid snaps into place on corners and adds functionality by sealing in freshness, making transport simple. Compatible with parchment paper or silicone baking mats if desired. Easy clean up; hand wash recommended. Pan exterior dimensions 12.9 x 9.5 x 2.5 inches and interior dimensions 12.1 x 8.8 x 2.5 inches. Lid measures 13.5 x 9.8 x 3.4 inches. Made in USA