What is a bansuri?

A bansuri is a transverse flute cut from a single length of seasoned bamboo. It has no keys and no moving parts, only six or eight finger holes. The maker burns or drills the blow hole and the finger holes. The player controls pitch through the lips at the blow hole, breath pressure and half-holing, covering a finger hole in part, which gives the slides and bends of a raga. Until the 1940s it was not thought a concert instrument; Pannalal Ghosh made a larger bansuri for the classical stage.