The BASIC Set / 17 mm: CBN-stone Apex Edge Pro Ganzo Ruixin Pro, TSPROF Hapstone
CBN (Cubic Boron Nitride) is the second-hardest material after diamond. H ello there,I have had a chance to use the stones on 2 knives. I must say they really do very well compared to my cheaper TSPROF diamond stones or my synthetics.