The Olfa Carbon Blades (50 pack) Standard-duty, snap-off blade is ideal for general use, cutting wallpaper, vinyl and paint protection applications, etc. (NOT recommended for use on glass). This blade is made from high-quality carbon tool steel. This 9mm blade fits Olfa Standard-Duty Knives.
13 cutting edges per blade.
**Care should always be used when cutting on glass! Be sure that you are using stainless steel blades; they are less likely to scratch glass than carbon blades.**