The Andis UltraEdge Detachable Blades are dependable long-life blades. Made from carbon-infused steel for a harder cutting surface that lasts longer. An innovative hardening process keeps blades sharper for a longer time. Add a special chrome finish that inhibits corrosion and you have a cutting solution that will last for years. Advice and Care: Clean your clipper blade after each use. Do this by brushing away excess hair. Never use water to wash blade as this will corrode the metal over time. After each use lubricate the blade by having the clipper pointing downwards, turning the clipper on and apply 2-3 drops of Andis Clipper Oil across the cutting blade. Run for 20 seconds then stop the clipper, unplug it from the power supply and wipe off the excess oil to prevent oil seeping into the motor. Store blades in a cool, dry place free from humidity and dust.