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the grit rating is ~600.
This is referred to as Nagura, but it is just a dressing stone. It is meant to clean the hone surface not for slurry generation, because it is very soft and releases...

You will have a mix of 600 grit and 1k grit, I did not particularly like to use it. The slurry from the conditioning stone will impart deeper scratches on the bevel, then you hav to clean the stone...

It is a mix of both slurries.
That stone that comes with the choseras is not slurry stone it is for conditioning AKA cleaning the surface of the stone.
I trashed mine as soon as I took them out of...