Oster CryogenX Clipper Blades. Oster CryogenX AgION blades have advanced, silver based AgION antimicrobial protection built in to prevent the growth of bacteria, mold and mildew on blade surfaces. Manufactured from fine-grain, high carbon steel that is cryogenically treated so edges stay sharp longer. Blades have a Rockwell Hardness rating of 62. Blades stay ultra cool for optimum durability. Compatible with all Oster, Andis and Wahl detachable clippers. Blade clipping lengths are achieved by cutting against the lie of the hair. When cutting in the direction the hair lies, length will approximately double. Extensive range of sizes available.