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I like this one a lot. I'd call the white side 8K+ and the brown side maybe 4k. I can slowly sharpen with the brown side, but not put a bevel on a blade. The white side is an excellent finisher.
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This one seems to be around 1k in grit. You can feel the grit when you rub it and can even see individual particles. Water goes through it like a sieve. When I tried lapping it, I went through 3...