Feather super blades will fit any of the artist club razors. Manufactured to the highest quality standards, and designed for professional use, you can expect them to provide the closest and smoothest shave possible. Astoundingly sharp, the super blades are designed for heavy or coarse beards. Blade performance is equal to that of a 6/8 or 7/8 size traditional straight razor to meet the demands of a tougher beard. In addition to a thicker blade, the super is also a bit wider allowing greater edge exposure. If you have a tough beard and want to delay the appearance of five o'clock shadow until well after sunset, the super blade is your choice.