Amazon.com ReviewDistinguished among All-Clad's renowned cookware collections by its stylish, charcoal-black, hard-anodized aluminum exterior, the LTD line provides serious and professional cooks all the virtues that make All-Clad's worldwide reputation unsurpassed. Key to its high performance is a three-ply, bonded construction. Sandwiched between the exterior and the interior is a thick core of pure aluminum that spreads heat evenly across the bottoms of pots and pans and all the way up the sides. The striking exterior resists scratching, chipping, and peeling. Certain pieces, like this one, have two interior layers, one of 18/10 stainless steel and the other of scratch-resistant, professional-grade nonstick coating bonded to the steel.