Hornbostel - Sachs
End-blown labrosones
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. The air-stream passes through the player's vibrating lips, so gaining intermittent access to the air column which is to be made to vibrate. The body of the instrument is a curved or folded tube. The instrument is end-blown.
End-blown labrosones with curved or folded tubes
End-blown labrosones with curved or folded tubes, without mouthpiece
End-blown labrosones with curved or folded tubes, with mouthpiece