QUARTER SHEET PAN: Whip up your favorite baked goods with our durable, rust-proof, aluminum cookie sheets for baking, oven safe up to 450F. Baking tray: 13 in. x 9.5 in. x 1 in. Baking surface: 12.4 in. x 9 in.9 x13 COOKIE SHEET FOR BAKING: Light-colored aluminum 1/4 sheet pans for baking heat up quickly, browning food evenly without overbaking it. Aluminum pans also cool down quickly, reducing wait time between batches.GALVANIZED STEEL RIM: The raised rim of this large baking sheet pan is reinforced with encapsulated steel wire to add strength and prevent warping.NATURALLY LOW-STICK: Unlike a non stick baking sheet, this baking pan is BPA, PTFE and PFOA free. To reduce sticking, line pans with silicone baking mats or parchment paper or grease pans before cooking.HAND WASH RECOMMENDED: Aluminum is reactive to acidic ingredients like vinegar and tomatoes, which can cause pitting or corrosion. Use nylon, wood or silicone utensils to avoid scratching the 1/4 sheet cake pan.