Feather "Professional Super" blades will fit any of the "Artist Club" series razors. Manufactured to the highest quality standards and designed for professional use you can expect them to provide the closest and smoothest shave possible. The "Professional Super" blades are designed for those with a heavy or coarse beard. Blade performance is equal to that of a 6/8 or 7/8 size traditional straight razor - A bit more aggressive to meet the demands of a tougher beard. In addition to a greater blade thickness the blade 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 "Professional Super" blade is your choice. Blades are packed in their own injector-style dispenser for fast easy and safe blade installation and convenient storage. Package has a safe disposal slot for used blades on the bottom.