The Olfa LBB-50B UltraMax 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% sharper than the standard Olfa LB Carbon blades.
DO NOT use these blades for cutting and trimming on glass as they will leave scratches.