Standard-duty, snap-off blade is idea for general crafts, cutting wallpaper, etc. This blade made from high quality carbon tool steel is produced using OLFA's precise multi-step production process for unparalleled sharpness and superior edge retention. Long lasting durable snap-off blade - a new sharp edge with each snap. This 18mm blade fits OLFA Standard-Duty Knives. 13 cutting edges per blade. 50 blades per pack.