De buyer pans are high qualify carbonated steel pans. They need to be seasoned, much like a cast iron pan. They are thick and hold heat well too, though not as much as cast iron. Still good for searing though. What I love with those pans is that they are very flat (don't no if I can say it like that), like Teflon pans and unlike cast iron, so I find that cooking eggs is much easier. They are lighter and you can still use metal utensils.

It's an in-between cast iron and stainless steel cookware. In my opinion, they are better than cast iron. I'm slowly replacing my cast iron cookware with these. They are more expensive, but worth it.