The Zwilling J.A. Henckels Spirit Stainless Steel Cookware features a magnetic stainless steel exterior with a strong aluminum core. This energy efficient cookware conducts and retains heat evenly from rim to rim for uniform cooking with no hot spots. With its excellent heat conduction, Zwilling J.A. Henckels Spirit Stainless Steel Cookware is a product that should not be missing in your kitchen. Dishwasher safe, lifetime warranty.