Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. sound device components
7. aerophone components

Anotations

Scope note:

In brass instruments, U-shaped segments of cylindrical tubing fitted over two straight segments of tubing in such a way as to be able to slide easily in and out, thus changing the instrument's effective total length, and with it, its fundamental pitch during play.