Material: New and improved Anodised Aluminium Coating: Triple layer of new Teflon Platinum Handles: Riveted Stainless Steel The Hard Anodised treatment process is a recent development to harden the surface of aluminium cookware. This process results in a surface finish which is very hard, and impervious to food acids. The pan itself retains the even heating and heat conductivity of aluminium. All items have been tested to British Standards.