**Please note: I do not, in any way shape or form, put grit ratings on natural hones. I find the entire idea of it nonsensical. Every stone I sell is suitable for putting a shaving edge on razors, unless I explicitly say so. None of this "prepolisher" or "sub-pre-polisher post bevel" nonsense. I recommend using slurry on all Japanese hones, if you don't want to, that's your business.**
This is a grey-blue finishing stone from Shoubudani mine in Kyoto. It's a very hard, fine finishing stone. It has a smattering of black specks that in no way affect the honing results. I've tested this hone on razors and find it to leave a good, smooth edge.
It's a razor sized hone, but very thick, so it has a good amount of weight to it, so hand-honing is only for the strong of hand.