Tsushima Black (Kuro) Nagura Small

Tsushima black nagura is a type of natural sharpening stone extracted from the sea bed of the island of Tsushima. It is about 6000 grit equivalent, and is great for kitchen knife and straight razor sharpening. The small nagura is used as a mud creating stone for other larger natural stones. 

Measurements:

45mm * 45mm * 45mm 
280g

Note: Individual atural stone may vary slightly in apperance, size and weight.