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Yes. Chosera are based on magnesia bond and have higher concentration of abrasive grain than SS.
So they are faster, but there are some downsides of such a bond.
Chosera stones can produce a...

Thanks for correction!

My sharpening experience is not limited to straight razors only. I sharpen all my kitchen knives, folders, chisels, planes, scissors and so on.
Because of such a broad...

BTW NANIWA produce much more than just these two lines, there are also NANIWA DIAMOND stones, woodworking stones, economy and pro lines for kitchen knives and so on.

As for the phrase about ...

NANIWA ( ナニワ研磨工業株式会社 / NANIWA ABRASIVE MFG. CO.,LTD.) is the name of manufacturer of both NANIWA Super Stones and NANIWA Chosera lines.
So it is a bad idea to compare NANIWA with Chosera.

Chosera...