All-Clad Copper Core cookware offers 5-ply construction, consisting of alternating layers of aluminum, stainless steel and the superior copper heat conductivity element. Features a high-polished exterior adorned with a copper ring accent and stay-cool long handles. This collection is compatible for all cooktops including induction and is oven safe. 5-ply construction; alternating layers of stainless steel & aluminum with copper core. This combination provides high performance cooking with maximum temperature control allowing for rapid & even heat distribution. All-Clad Copper Core is the choice for true connoisseurs. Lifetime Warranty, Made in USA.