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All Oster® blades are put through a 12 step process guaranteeing quality and craftsmanship. Oster® starts 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. Oster®’s patented Cryogen-X™ process takes the blades down to -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.