The EATEX Aluminum cookie sheet pan is the perfect addition to whip up your favorite baked goods and baking sheet pan dinners with this durable, rust-proof aluminum baking sheet. LARGE BAKING PAN SET OF 12: Whip up baked goods and sheet pan dinners with these durable, rust-proof aluminum baking sheets, oven safe up to 450F. Large cookie sheet: 21.5" x 15.5" x 1". Baking surface: 21" x 15.27".COOKIE SHEETS FOR BAKING: Light-colored aluminum sheet pans for baking heat up quickly and brown food evenly without overbaking. Aluminum baking pans cool down quickly, reducing wait time between batches. GALVANIZED STEEL RIM: The raised rim of our cookie sheet pan is reinforced with encapsulated steel wire to add strength and prevent warping. NATURALLY LOW-STICK: This baking sheet set is BPA, PTFE, and PFOA free, with no nonstick coating. To reduce sticking, line the cookie sheet set with silicone baking mats or parchment paper, or grease pans before cooking. HAND WASH RECOMMENDED: Aluminum baking pans set is reactive to acidic ingredients like vinegar and tomatoes, which can cause corrosion. Use nylon, wood or silicone utensils to avoid scratching the sheet cake pan.