Oster Cryogen-X Pet Clipper Blades Oster Cryogen-X blades are made using a 12 step process that ensures superior Cutting quality The size 40 blade leaves the coat 1/100" and is a great blade to use when using a guide comb for longer lengths Patented Cryogen-X process take the blade to -300 degree F for extra hardness Hand lapped for a smooth cut finish Handcrafted in the USA