All Derby razor blades are manufactured from stainless razor blade steel strip from Sweden hardened and ground by utilizing most advanced equipment all derby razor blades cutting edges are deposited with chromium ceramic, tungsten and platinum by advanced spluttering equipment for optimum edge strength thus longer shaving life. All Derby razor blades coated with a polymer for optimum shaving comfort from beginning to end, all Derby razor blades are subjected to severe quality control inspection at every stage of manufacturing processes by utilization of unique quality control equipment.