Mikawa Shiro Nagura Koma 3.6oz. (103g) Japanese Natural Sharpening Stone
$48.00
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Mikawa Shiro Nagura Koma 3.6oz. (103g) Japanese Natural Sharpening Stone Approximately 35mmx45mmx35mm According to Dr. Kuniichi Tawara who is a Metallurgy doctor, and very famous Japanese sword researcher, Koma molecule is 10 to 20 micron. It should be right before fine grit sharpening.
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