Baking just got bigger! Great for making large batches of cookies, veggies or appetizers, this performance pans mega baking sheet helps you get more done in less time. No more swapping baking sheets in and out of the oven; with this extra large 21 x 15,inch sheet pan, you can bake all your cookies, all your appetizers, or all your meat and veggies at one time. Made of anodized aluminum, this pan is rust,resistant for long,lasting use. It also heats evenly for uniform baking. For even browning and cooking, we do suggest using this pan on the top rack of your oven.