These screws are made from phosphor bronze, which has become popular recently.
 For Bach trumpets.
 It's brand new.
 It has slightly more resistance than brass, allowing you to press the accelerator harder.
 It adds warmth and makes it easier to produce a three-dimensional, dignified sound.
 It also goes great with cornet and flugelhorn.

 It seems like it would be effective for orchestral, chamber music, and jazz solos.
 Silver plated finish.

 This is a custom part that is only made by UPMAKE. Please try it out. One set contains two pieces.

 Fits current 180ML and 190ML models. Please note that it may not fit special models.