De Buyer Prima Matera Straight Sauté-pan with Magnetic Bottom. The utensils in the PRIMA MATERA range are 90% copper and 10% stainless steel on the inside. Copper is the best heat conductor and ensures a perfect heating circuit throughout the entire container. It provides exceptional cooking performance on any cook top, including induction, through the special iron-magnetic stainless steel INDUCTION bottom. Elegant and fluid, the ergonomic long handles and side handles of the range are made with cast stainless steel. The stainless steel interior makes it easy to clean your copper utensils.