Five segmented carbon steel blades packaged in a re-usable plastic container that safely stores and protects blades. The segmented blade allows dull edges to be snapped-off as needed, revealing a fresh sharp edge. The heavy-duty blades each have 8 segments and are for use with the Locking Snap-Off Heavy-Duty Blade Knife (AA17976) as well as most other heavy-duty snap-off knives. Brand: Art Alternatives