This is the ProGuard version of the Feather Injector blades range, which are compatible with the range of Feather Artist cut throat razors. They are also suitable for the Cobra Safety Razor and our own Claymore and Above the Tie single edge razors.\nWorld famous blade technology from Jatai of Japan, known as the makers of the best and sharpest razor blades in the world.\nFeather Razor Blades are more commonly known as injector razor blades. Feather Razor Blades are not only extremely sharp, they last longer too, in our experience you get at least 50% extra shaving life from a Feather compared to other brands.\nThe injector system ensures quick and safe blade replacement. The blades are stored safely and securely in a metal and plastic container whilst not in use.