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Koppa are small sized or oddly shaped stones that are cut from the same stock and preform the same as larger more regularly shaped premium stones but are far less expensive.
A ‘Higashi-Mono’ (Eastern Mine) whetstone that is close in proximity to Takashima and Wakasa, two mines known for their high density stones.
A ‘Higashi-mono’ (Eastern Mine Stone), The Shoubudani mine produces some of the higher quality natural whetstones that are akin to Nakayama mine stones in their beautiful finish.
These koppa stones have been graded by us by weight and geometry only, they have not been individually graded by hardness and fineness, koppa are sold at random only, we will not select individual stones from the photo. For individually graded stones please see our other listings.
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Review Aiiwatani / Shoubudani Rectangular Koppa 300-350 Grams Tennen Toishi Honyama Natural Finishing Stone