Calphalon AccuCore Stainless Steel cookware is made from 5 individual metal layers with a responsive copper core that heats - and cools - evenly to help maintain a more consistent temperature across the entire pan. Exceptionally even heating ensures optimum cooking performance. Two inner layers of aluminum also efficiently conduct heat, while stainless steel outer layers create a beautiful, durable surface that is dishwasher safe. Stainless steel is an exceptionally versatile cooking surface and is the best choice for high-temperature techniques such as searing and deglazing. Ergonomic, stay-cool stainless steel.