Mauviel M’150 Ci Copper 11.7-Quart Stockpot With Lid and Cast Iron Handles. The Mauviel M’Heritage cookware collection allows you to cook with unsurpassed heat conductivity and control thanks to it’s 90% copper, 10% stainless steel construction. The M’150 Ci collection features classic cast iron handles and a polished copper exterior, and an 18/10 stainless interior. The cookware has a thickness of 1.5 mm, and the copper exterior allows for superior heat conduction and control. The M’Heritage collection represents the total experience and heritage of Mauviel 1830. International Buyers – Please Note. These charges are the buyers responsibility. We do not mark merchandise values below value or mark items as gifts – US and International government regulations prohibit such behavior.