All-Clad's Limited (LTD) line features a dark, hard anodized aluminum exterior layer that won't scratch, peel or chip. The pure aluminum core not only covers the bottom of the pan, but also extends up the sides. This allows for great heat conductivity as well as an even heat distribution so you will never have any "hot spots" when cooking. The stainless steel interior is stick resistant, and the polished stainless handles are secured with sturdy, non-corrosive rivets. Hand washing is recommended when cleaning All-Clad LTD cookware. Lifetime Warranty.