Fat Daddio's aluminum bakeware is anodized to ensure superior durability and a lifetime of baking confidence. Why Anodizing? Anodizing is a safe, environmentally friendly, electrochemical process that thickens, toughens, and seals the naturally occurring protective oxide found on aluminum. The result is beautiful, aluminum bakeware with better cake release and clean up. A Professional, abrasion resistant pan that won't peel, chip, flake, or chalk. Fat Daddio's pans won't discolor like natural aluminum and are protected from all acidic foods and detergents. Fat Daddio's manufactures low maintenance aluminum bakeware that is 100% dishwasher safe! With Fat Daddio's you get all the baking benefits of aluminum with the superior performance of anodizing.