It is a fragment of a natural whetstone mined in Honyama, Kyoto Prefecture.
The surface can be planarized with a diamond grindstone for use.
It is also possible to divide a piece with Hammer and put a thin piece on your fingertip to sharpen the knife.
It is a genuine piece of natural whetstone.
Specification
The brand name is the difference between the stone color and the pattern
Questions
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