Replacement razor blades for the double-edged safety razor. All Derby Razor Blades start with stainless steel from Sweden. Once manufactured, the blades are perforated, hardened and ground by utilizing the most advanced equipment. Derby Razor Blades' cutting edges are deposited with chromium-ceramic, platinum and tungsten, and are reviewed through strict quality control inspections at every stage of the manufacturing process.Includes:4 packs of 5 blades (20 blades in total)