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Chosera sharpening stones are used for sharpening knives on Edge Pro and Hapstone Pro sharpeners. Chosera is a high-end series from Naniwa. Chosera stones are made of aluminum oxide. All Chosera stones are 6 mm thick and are mounted on high quality aluminum blanks. Chosera series stones are universal, and can be used to sharpen knives of any steel. Do not soak Chosera stones in water. Just splash, or use a water spray. Never store Chosera stones in water. Never dry Chosera stones near heat.