All Derby razor blades are manufactured from stainless steel razor blade steel strip from Sweden, hardened and ground by using the most advanced equipment.All derby razor blades cutting edges are trimmed with chrome ceramic, tungsten and platinum by advanced sputtering equipment for optimum edge strength and thus longer life. All Derby razors are coated with a polymer for optimal shaving comfort from start to finish, all Derby razors are subject to strict quality controls at every stage of the production process by using unique quality control equipment.