Oster? Professional blades are produced from the finest high-carbon steel and handcrafted to our rigorous standards, providing unparalleled precision and performance. Furthermore, our U.S. made blades are hardened to RC62-66 (Rockwell Scale C) in-house prior to receiving a cryogenic treatment which further enhances the hardening process. The blade cutting surfaces are then sharpened, finished and tested with proven Oster? proprietary processes, ensuring ultra-sharp blades that continue to stand the test of time. Available in multiple sizes for various cutting lengths and maximum versatility. Powerful, heavy duty universal motor cuts through thick, wet hair efficently and quickly Detachable Cryogen-x blade system allows quick and easy blade changing, thirteen blade sizes available Strong valox material makes the clipper housing virtually unbreakable