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'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 9mm blade fits Olfa Standard-Duty Knives. 13 cutting edges per blade. 50 blades per pack. 58 degree blade. (All blades can scratch glass)