The item is defective, is oval shapeTefal advertise that one of the benefits of the Ingenio range is the ability to stack pans inside each other for easier storage. Well after four years of (gently) placing smaller pans inside, the non-stick coating started to chip. At first it wasn't very noticeable, but within a few weeks the whole coating was coming away. Tefal claim to have a lifetime guarantee, but in this case they said it was my own fault, even though they are the ones suggesting you stack pans inside each other. Apart from this issue, it had been a great wok.This is the WOK for use with an INDUCTION HobIf you want a non-induction WOK, you need the Essentials range, it's also a LOT CHEAPER (currently on offer @ £17.16)Here is the Amazon Link:We love this wok so much we purchased a second one. It is used nearly every day for stir fry, soups, stews, curries. You name it, we use it. It also gets taken for picnic fry ups and on holiday when we are self catering. We purchased our first one years ago but it wasn't suitable for induction hobs. Not to be wasted, it was passed on to our daughter. We ruined our next one by using frylight in it so lesson learned. It did not put us off buying more and can highly recommend buying this make. We have the Ingenio because of the space saving and have also invested in the saucepans. Easily a 5* buy.I have bought two sets of these, I keep one on the yacht, they are very good quality, and what I really ❤️❤️like about them is the handle comes off and clips on to any of the other pens of the same make.Makes it very easy to store and you need less room, thoroughly recommend them. Are use one of these instead of a normal frying pan as it also stops the fat flying all over the place❤️❤️I've been through two of these, both developed the same fault. The cheap flimsy plate on the bottom to make this pan compatible with induction jobs just detaches after a year or so of use. When I claimed on the warranty with the first one Tefal suggested I only hand wash the pan, which they sell as dishwasher safe. If they would just stop cheaping out and put a proper induction base this would be a good item.