Hard Anodising was first developed by Russian scientists to produce a metal surface tough enough for space travel. The same technology is used by Futura to make Hard Anodised Cookware. The Hard Anodised surface is harder than steel with wonderful properties for cooking.The round bottom has two important functions: it allows you to get cooking depth with minimal amount of oil, and the curved body spreads the gas flames and the gases well, heating food quickly and evenly.