Cubic Born Nitrade Extraction 7 is a specially formulated, man-made material that is harder than a diamond. C-BNX7 is perfectly suited and expecially made for sharpening your blades to a perfect, razor-sharp edge.
·C-BNX7 (cubic boron nitride extraction 7) construction
·Measures 4" x 2" x 1/2" to stow easily in your gear
·Made in China