I just received this in the mail from Mr. Aoki at aframestokyo. Yes I did take a picture before I tried it out. It is very smooth and very hard. Without Nagura's its just a nice smooth stone. Here a nice picture of it. Roughly a 6inX6in square. Oh and if someone has a Koma nagura they would sell me I would be forever in there debt!! Or at least very very grateful.

Stan