Ultra Sharp black snap-off blades are exclusively designed for maximum cutting performance and are ideal for applications where superior sharpness is required. Made from high-quality Japanese grade carbon tool steel, the OLFA black blades are double-honed for extreme sharpness and are 25-Percent sharper than the OLFA silver 9mm AB blades. Long lasting, durable snap-off blade-a new sharp edge with just a snap. Fits OLFA 9mm handles. (2 PACK)