Spyderco 204CBN Cubic Boron Nitride-sharpening steels

These Spyderco CBN-sharpening rods quickly sharpen your blunt knives. CBN (Cubic Born Nitride) is one of the hardest materials on earth. Comparable to diamond. The grain size of the CBN rods is even the same as that of the diamond rods. The only difference with the diamond sharpening rods is that the CBN rods remove material faster. In no time the edge is sharp again. As such the CBN rods are an indispensable accessory when you want to re-profile an edge with the Sharpmaker.