Big craggy stone here with lots of surface, very unrefined corners but some straight sides to work with.
Hard and fine Ozuku stone LV5 fineness and LV5 hardness. These are fast, fine and exactly what you would expect from Ozuku, just less expensive than a premium sized stone from this mine. These Ozuku koppa will need a little work to polish the face, and possibly stabilize small cracks, they are priced as such.
Being koppa there are roughly cut and do not have a polished face or lacquered sides, measurements are from the widest dimensions.
This stone is great for razors but less suitable for most knives, there can be applications for a stone of this hardness and fineness with ura of single bevel knives and tools that benefit from a fine finish but the stone will be scratchy on the wide face of a steel with large carbides.