Professional paella pans are typically made from Polished Carbon Steel, Enamelled Steel, or Stainless Steel. Carbon Steel is the traditional choice, favored for its excellent heat conductivity and ability to create the 'socarrat' (caramelized crust), though it requires seasoning to prevent rust. Enamelled Steel offers a non-reactive surface that is easier to maintain and does not require seasoning, making it ideal for high-volume commercial kitchens. Stainless Steel provides a premium aesthetic and durability but may have slightly less even heat distribution unless it features a sandwich base.