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Check the listing for details. Ceramic Sharpening Rod, 11-inch Shatterproof Ceramic Sharpening Rod. Condition: New. Listed at 29.65 USD. DURABILITY with the highest quality ceramic available on the market – hardness of this ceramic sharpening steel is 9 Mohs (SGS tested). Rockwell hardness over 100 (Yes, that's correct). Grit #1500.