Fat Daddio's cookie sheets are made of 10-gauge anodized aluminum, which ensures even heat transfer. Each end of the pan is angled at 45 degrees for extra stability. The anodizing process ensures that metal never leaches into food, and creates a sturdy, smooth surface that cleans easily. These cookie sheets were lightly scratched during delivery to the Fat Daddio's warehouse. The damage is cosmetic and does not affect the performance of the cookie sheets. For 43 years, Fat Daddio's has been a manufacturer of quality bakeware for professional bakers, pastry chefs and artisans. Fat Daddio's offers hundreds of products, from anodized aluminum pans, to candy molds, silicone mats and pastry tools.