Good Cook AirPerfect (don't see brand on them but believe to be) 2-pack nonstick insulated cookie sheet - definitely air bake sheets. It is designed with an insulated layer to ensure even baking and prevent burning. The nonstick carbon steel surface allows for easy food release and cleanup. The large size is approximately 16 inches by 14 inches. It is dishwasher safe. One does have a dented corner, shouldn't affect use. See pics for best description and ask any questions.