Stainless steel snap-off blades for use in moist environments (wallpapering, window films, etc.) where rust is a concern. This blade made from high quality steel is produced using Olfa 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 9Mm blade fits Olfa standard-duty knives. 13 cutting edges per blade. Cutting wallpaper, window films, caulking, art & craft applications, etc.