Search:

they have both synthetic and natural
There is another place that you can get natural Aoto, and it comes in grades:
The Epicurean Edge: Japanese and European professional chefs knives

that's the other site that Hida Tool owners run.
by the way the 5k Suehiro Rika is a very good stone, its very fast for 5k , pretty much feels like 1k stone.

If you are talking about hida tool, they for some reason take forever to ship their stuff. They charged me for UPS shipping but it took 2 weeks to get the stone:thinking:

Here
another source of nat AOTO
they also have several different grades to chose from.

I'll admit I used my 1k SS for sharpening knives which is not the same as razors.My bigger problem was that the stone would glaze too much for my liking and I had to lap it several times during...

The 1k Super Stone, dishes pretty handily, the Chosera dishes slower however.