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Oster’s Cryogen blades are suitable for use on horses or family pets. Oster’s Cryogen-X™ process deep freezes the blade down to -300 degrees which produces a harder, and sharper blade while helping to extend the blade’s life. Oster’s blades are fine-grain carbon steel with a Rockwell Hardness Rating of 62. The #40 blade leaves hair 1/100” and is suitable for use with Oster A6, Golden A5, Turbo A5, Power Max or PowerPro Ultra clippers.