Rockwell Razors Double-Edge Razor Blades is for those looking to replace their blades. Each blade lasts between 4 - 8 shaves, depending on your facial hair thickness. They are made of pure Swedish Stainless Steel and are compatible with all double-edge safety razors. The stainless steel protects them against rust, while the specialized treatment that crafts these blades ensures the blades retain their exceptional sharpness.