BOUSUGAI is a tool to put out the luster of the comb.
The surface of the shell that is called BOUZU shellfish is flatly sharpened with the whetstone, the boundary of the smooth side and the curved surface is held to the comb, it rubs back and forth, and it polishes.
The cloth roundly sewn is applied, and the shellfish is made easy to grip.
Kiso no orokugushi ; The comb in japan.