Naniwa low grit bricks

Made these recent rock purchases I note these are more for knife work and possibly some razor roughing out if required
first is Naniwa 150 grit New Omura 210x78x55mm thick (grey)
Secondly a Naniwa 600 grit Akamonzen 210x75x70mm thick (red)
Both are true blricks but should last a while I think

Attachment 297891
Attachment 297893
Attachment 297892

I picked up a 4,6,& 800 grt. set of Nanis, for the same reason.

Quote:

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Originally Posted by Substance

Made these recent rock purchases [...]
first is Naniwa 150 grit New Omura 210x78x55mm thick (grey)
Secondly a Naniwa 600 grit Akamonzen 210x75x70mm thick (red)
[...]

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I've been curious about these 2 for a while now. Care to update this with some comments about either, or both, of these nice bricks?