Viking 3-Ply Hammered Copper Cookware delivers superior performance in cooking with a beautiful, copper exterior finish. Because copper is highly conductive, cooking can be more precise while requiring lower levels of heat needed to make that masterpiece dish. The aluminum core helps to distribute heat evenly across both the bottom and sides of the pan while the interior cooking surface is made from non-reactive surgical grade 304 stainless steel. The look-and-cook vented glass lids help to reduce boil-overs while allowing you to see the cooking progress of your meal without lifting the lid and allowing heat to escape.