carbon steel which will never rust for long time of durability For sweet or savory baking; from cookie to sheet pan dinners Meet most of your daily oven pans need Flexible and stackable, making metal baking pans store easily Nonstick surfaces inside and out, making rectangle baking sheets for oven easy to clean, hand wash recommended These nonstick baking sheets set are oven safe, retain consistent heating and will not warps and take out of shape