Each of the Circulon Momentum bakeware pieces within this set has raised circles which means that food cooks and releases on the entire surface but only a fraction of the baking surface takes the abuse of any utensils used, this is what we pride our innovation on. The Circulon Total non stick system gives you an unbeatable non stick surface that\'s durable and will last for years to come due to our tough carbon steel material. All of our bakeware comes with our hassle free lifetime guarantee.