Hornbostel - Sachs
Stopped flutes with internal duct
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. A narrow duct directs the air stream against the sharp edge of a lateral orifice. The duct is inside the tube. The lower end of the tube is closed. The instrument has fingerholes. Morocco.
Stopped flutes with internal duct, with fingerholes