Single Edge - Ultra Sharp Chromium - Ceramic - Platinum - Tungsten and Polymer Coated Edges From beginning to end, all Derby Razor Blades are subjected to severe Quality Control Inspection at every stage of manufacturing process by utilization of unique quality control equipment. These high quality interchangeable razor blades are made from refined and intensively processed Swedish carbon steel. The razors are especially suitable for sensitive to normal skin and light to heavy beard growth. Double edged blades are increasingly only used to be split in half. These single edged razors are made specifically for such shaving utensils and each are individually wrapped in wax paper to maintain excellence and sharpness. Chromium-Ceramic-Platium-Tungsten and Polymer Coated Edges Derby Premium Single Edge Razor Blades are designed to be incredibly durable and long-lasting, made from the highest quality steel strip in their hallowed Swedish factory.