Calphalon AcCuCore Stainless Steel Cookware. Five layers with copper core for controlled, even heating. Exceptionally even heating ensures optimum cooking performance. Calphalon AcCuCore 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. 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.