Chosera sharpening stones are used for sharpening knives on Hapstone knife sharpeners. Chosera is a high-end series from Naniwa made of aluminum oxide with the magnesia binder. The magnesia binder...

  Venev Ursa Series Dual Side Diamonds are used for sharpening knives on Hapstone guided knife sharpeners, as well as freehand sharpening. Diamond sharpening stones offer excellent performance in sharpening knives...