Info on an Izumi Jnat?

Has anyone heard of an Izumi? I can't seem to find any info on it. Maybe it's just a term or word for something else. Also it's from the Morihei site, which is all Japanese, so the Google translation plug-in could've mistranslated. It's categorized as a naka-to/medium grit stone at ~$190, but seems a good size. Any insight would be appreciated. Thanks.

http://www.morihei.co.jp/?pid=105916102

Also, they have an aizu for under $100 at a decent price. I've been looking for one for some time now. Can anyone give me a quick assessment on how it looks?

http://www.morihei.co.jp/?pid=105915694


You guys rock!

No idea mate. Everything I've got from Morihei has been excellent. Except an aizu which broke. Actually, that's not true, the stone is excellent but it broke. They sell good stuff.