| 摘要 |
A musical instrument is disclosed which comprises a tubular member having an inlet end, an outlet end having a circumferential lip, an exterior surface; and an interior surface having a rib, a movable stopper member having an indentation and a rod connected to the movable stopper member, the movable stopper member and the rod for insertion within the tubular member and the movable stopper member movable between the inlet end and the circumferential lip of the tubular member along the rib. |
