All-Clad's Cop-R-Chef combines the old world elegance and beauty of copper with the practicality and durability of modern technology. Each piece of All-Clad cookware features copper-clad stainless steel cookware with an aluminum core. All-Clad Cop-R-Chef cookware combines an easy to care for, highly polished stainless steel interior that is stick and corrosion resistant with a thick core of three separate layers of aluminum that retains heat and evenly distributes it along the bottom and all the way up the sides. Cop-R-Chef's extra thick copper exterior offers a sophisticated look, while the stainless steel interior adds ease and practicality. Unlike traditional copper cookware, All-Clad’s Cop-R-Chef never needs re-tinning. All-Clad’s signature stay cool stainless steel handles are permanently attached with stainless steel rivets. Like the rest of the All-Clad lines, Cop-R-Chef carries a lifetime warrantee.