This Mauviel copper Pan is made from 1.55 mm solid copper lined with stainless steel. This provides 2 benfits. Firstly, perfect and even heat distribution. Secondly, perfect control for the cook - especially when using a gas hob. Turn the heat up and down as you wish and you will see an almost immediate effect in the pan. Mauviel Copper Pans - are lined with a durable layer of 18/10 stainless steeel. Metal utensils can be used and retinning will never be necessary. Mauviel Copper Pans carry a 25yr gurantee.