Feather Professional Blades are high quality blades produced in Japan, ideal for both professional or home use.  Suitable for all of our Japanese style razors - KAMI-1, KAMI-3, KAMI-3. Not suitable for our other cut throat razors or safety razors. Feather Razor Blades are not only extremely sharp they're long lasting too. Expect 10-12 comfortable, close shaves per blade. The injector system ensures quick and safe blade replacement. The difference - Thicker blade. Thicker blade recommended for heavy shaving or hard beard stubble. Product information: The professional blade is given a triple grinding for optimum edge angle. In addition to the grinding, each blade is also given a double coating.