This is an ultra-sharp premium max snap-off blade. 8 point designed for maximum cutting performance. It is ideal for applications where superior sharpness is required. These blades are made from high quality carbon tool steel for extreme sharpness. 25% sharper than OLFA silver blades. Black blades. 9mm. 3/8". 130 cutting edges. Fits all OLFA 9mm precision snap-off utility knifes. 10 blades.