Yes, they are from East Oohira. I've honed 10 razors already and like the stones more and more. From one side they are soft and flexible (hardness 4 out of five), from the other side they cut very well, even without slurry. Looks like these stones are wonderful pre-finishers. It is not correct to measure jnats in grits, but from my point of view with different naguras the stones can cover honing portion from 6K to 12K.