Usuba Kuro-Ochi - vegetable knife
The usuba is a thin bladed vegetable knife, which whilst somewhat resembling a cleaver is used to accurately slice rather than chop vegetables, its narrow profile and acute edge profile designed to cut more delicate vegetables without crushing, or breaking their stems. These should always be used on a wooden or plastic boards, and wiped and dried after use to protect both the hard carbon steel edge, and the wood of the handle. About 61 HRC. Blade about 17cm, overall length 30cm. You can find out about the use and care of these knives here.