This is a unique item from Shun. It's basically their version of a traditional Japanese folder called a Higo Nokami which was first manufactured in 1896 in Meiji-era Japan. The blade tang protrudes and can be used like a small lever to open the knife with one hand. One knife included.
The steel used is VG10 and it makes a perfect personal steak knife. The Shun Higo Nokami is six inches long when opened and folds to just three and a half inches when closed. The ebony pakka wood handle features an inlaid mosaic crest. Includes a nice leather sheath and black lacquered presentation case.