By far the ultimate in high-performance cookware, All-Clad's innovative Copper Core collection combines the ease of maintenance with the superb heat conductivity of copper. Constructed with gleaming stainless steel on the interior and exterior for durability, nonreactive cooking, and stick resistance, this series is crafted of a unique five-ply construction. A pure copper core runs through the bottom and walls of each pan for fast, even heating and is displayed in an elegant single stripe that runs around the outside perimeter of each pan. For durability and maximum heat transfer, the copper core is bonded to the stainless steel on either side with a layer of aluminum for durability and maximum heat transfer. Secured with noncorrosive steel rivets, All-Clad's Copper Core line has ergonomically designed stay-cool stainless-steel handles on pans and lids. Copper Core pans all have rolled edges for dripless pouring. Shiny copper lids enhance the cookware's striking design and fit tightly to lock in flavors and heat. With its durable construction, All-Clad cookware is designed to last a lifetime; to preserve the beauty of this cookware, hand washing is recommended.