Airbake Non-Stick Mega Cookie Sheet, 20 x 15.5in Baking pan made of 100 percent aluminum; nonstick coating for quick cleanup Decreases bake times by up to 15% over traditional insulated bakeware Insulated to prevent top sheet from overheating; no-rust promise 15-1/2 by 20 inches; dishwasher safe; safe with metal utensils Lifetime warranty