All of Oster® blades are put through a 12 step process guaranteeing quality and craftsmanship. They start with a fine-grain carbon steel that is heat treated to create a hard surface for greater wear resistance, leveraging a Rockwell Hardness Rating of 62. The patented Cryogen-X™process takes the blades down to a -300 degrees for a deep freeze, producing a harder, sharper blade which extends the product life. Each blade is then hand lapped for a smooth cut finish.

• Size 40 detachable pet clipper blade cuts hair to 1/100 inch (0.25mm)
• Fits Oster A6, Golden A5, Turbo A5, Power Max, and PowerPro Ultra Clippers
• Designed for extremely close clipper work on animals
• Heat treated to more than 1,000 degrees F for added toughness and strength
• Cryogenically frozen for durability