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All Oster Cryotech-X blades are cryogenically treated by being deep frozen to 300 degrees below zero, so molecules are aligned in a perfect structure. The result is a harder, denser metal that holds a sharper edge through prolonged usage.Withstand more sharpening treatments for unsurpassed longevity.Sharper blades glide through coats with less effort, saving you and your clipper from unecessary fatigue and wear.Longer lasting blades increase the value of your investment.Compatible with Oster(reg), Laube(reg), Andis(reg), Conair(reg) and Wahl(reg) detachable clippers.Oster A5 Cryogen-X Clipper BladesAre manufactured from fine-grain carbon steel and have a Rockwell Hardness rating of 62. Oster A5 Elite Cryogen-X Clipper BladesHave a special titanium carbonitride coating that protects blades from scratching and rusting--last longer than regular steel blades. Elite blades have a Rockwell Hardness rating of 82+.