I have looked for years for a black steel wok with a flat bottom it had to be thick steel to stop it from warping on the induction cooktop 3500W Burner. Well I found it made by the French company Mauviel it is 12.5" diameterwith 3mm thick steel the flat bottom is 4 1/2 inches, although it has a flat inside too it cooks wonderfully. The weight is 5lbs heavy but manageable .The cost is $100 considering there is no alternative it's cheap.Here is my review. I know there are people looking for a good wok for induction so I hope some find this post good information.I do have a JWright cast iron wok that I've used for 5 years and it too is great but it's discontinued. This M Steel Wok is much better. Posted some images of the seasoned wok so you can see it . This is after oven season @500 Degrees.Turning black already non stick .Happy ! Mauviel M'Steel Black Steel Wok, 11.8", Steel If you have any ?? please post i'll do my best to answer.