Aiiwatani Lv 5 (a3670)

Aiiwatani  Located north for Kyoto along with Takashima
They produce some of Harder and finer stones then ussual from that region. 
Very nice feel, smooth and hard 
Can be used as finisher for razors but also ultra fine finisher for knives and high end tools with Nagura 
Produce super nice finish and quite easy to use 
No toxic lines or inclusions at all ! 

Best With nagura 

size: 195mm 70mm 25mm