The metal valve guides are installed in place of the usual plastic ones. They are also available with plastic inserts that reduce the noise produced by friction.
The Research and Development Department of Stomvi has conducted a study on the effect of the trumpet valve caps and has been analyzing various masses to find the most suitable one to improve the response of the instrument.
The Research and Development Department of Stomvi has conducted a study on the acoustic effect of the valve bottom caps of the trumpet and has incorporated a soundbox inside the cap.
The Research and Development Department of Stomvi has conducted a study on the acoustic effect of the trumpet bottom caps and has incorporated a sound box inside the cap.