This is an extra fine Nakayama Mizu Asagi, approx. grit size is #10000-12000, our supplier highly recommend it as a razor's finisher. Very high density, water absorption is slow, Nagura is needed. Regain the sharpness of the blade and its sharpness lasts longer. Apart from the sharpening face, sealed lightly. There is 10mm difference in the thickness, I would recommend to set it on the base for keeping the sharpening face horizontal. On the right side of the sharpening face, there are a few Suji ( toxic ) line but they are avoidable in its position.
Please note that these are not for beginner sharpeners since they're harder to use.These are natural stones meaning that every single one of them are different so my measured size are not accurate. This is a life time investment for people who lives sharpening their knives, razors and tools, do not hesitate to ask me your questions|
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