Features:
1.The small valve knob is compatible with various types of small valve knob replacement and maintenance.
2.The small valve is hand-polished zinc alloy, made of natural stone.A great replacement button to replace old, broken and missing buttons.
3.Help to improve the accuracy of the keys and improve the fluency of playing.
4.Scope of application: Replacement of bass horn button on vertical key
5.Small finger key button cover size: Size: diameter 21.3MM, length 45.2MM