Olfa "HBB-20B" 25 mm Replacement Black Blades - 20 Pack

These Olfa 25 mm Replacement Blades have an exceptional razor-sharp edge. Premium black blade Japanese carbon tool steel coupled in a double-honed blade provide 25% more sharpness than silver OLFA blades. The 1" blade provides more leverage on extra heavy-duty substrates. Each blade come with seven segments. The segments are notched deep and straight to provide a clean snap. When a section is dull, simply snap for a new, ultra-sharp edge. OLFA Black Snap Blades are exceptionally sharp and durable for a variety of applications.  Sold as 20 PK of blades. Fits most Olfa 25 mm heavy duty snap-off utility knives.    Made in Japan.

From the Manufacturer - About OLFA:

    OLFA brand blades are made with top quality materials, forged with technologies that stem from traditional sword-making, sharpened with technologies that give a blade life, and ultimately finished with the craftsmanship that brings all of this together. The holders and handles that allow users to gain the full cutting performance of these high quality blades are designed, developed and manufactured in Japan and subjected to stringent quality checks throughout the process.