Mauviel M'150B 1.5mm Polished Copper & Stainless Steel Stewpan With Lid & Brass Handles, 6.3-Qt. The 100% Copper body is 1.5mm thick and is bonded to a very thin stainless interior. Stainless Steel interior is hard wearing, non-reactive and ideal for all types of cooking activities, is easy to clean and very durable.