Floors of pans are slightly curved in the cold condition, so that they can draw upon heating the surface. The "Delicia Pro" (unfortunately I read too late that other customers, this lament) is a bad design, because (confirmed by TEFALs "red dot") when heated to medium temperature, the ground bulges even more so that any liquid (fat or water) flows towards the edges and the center remains unaffected. A kitchen utensil for sale, which is completely useless, ever sell is the one that beyond customer policy then the other: I sent the "Delicia Pro" for 7 Porto to customer service of the French company Groupe SEB, which also TEFAL heard in Solingen, in order then to learn writing: "A defect or malfunction could not be determined". One should nevertheless provide, TEFAL seems to think, cut into strips and his Schnitzel as Sliced roast at the edges of the pan. This was complemented by the friendly question, if I make a point that you send me back the pan. I refrained. Expensive experience for anything other than the experience that I'm doing a very wide berth TEFAL in the future.