The shakuhachi is an end-blown Japanese bamboo flute associated with the
Fuke sect of Zen buddhism in the practice of sui zen.

araki3
Performance shakuhachi, made by Araki Kodo III

Another student of Araki Kodo V, Justin Senryu, has put together a comprehensive discussion of the instrument at http://senryushakuhachi.com/overview.  Please visit his site for more information.