Japanese natural sharpening stone whetstone. 
Size: 208-75-27mm / 8 1/2-3-1 inches thick
 
Weight: 860g  - 1lb.14oz
Hardness: ★★★☆ Mohs 3, common 4-
I have tested this Ozaki tenjyo strata awasedo stone with razors, knives, and tools. It is fast-cutting and excels with harder steels. The stone is peppered with the finest black "goma" sesame seed pattern. In my opinion I would use it either an ultra-fine knife stone or it could also be used as a prep stone for razors. This is a very homogenous stone, it has three missing corners and the price is reflected as such.