The NT Cutter Black Carbon Blades are a 10-pack of replacement blades for standard duty utility knives. They’re made from high-quality carbon tool steel and are produced through a multiple stage process to create a blade that is both sharp and long-lasting. The 60-degree angle makes them ideal for a variety of precision cutting tasks. These blades also feature a unique “Bluing process” which adds a black oxide coating to the blade. This coating helps to protect the blade from rusting.