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 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.