Stomvi Brass Valve Guides with Inserts (Set of 4)

Brass valve guides change how the horn resonates by increasing the mechanical damping. (Damping is any effect, either deliberately engendered or inherent to a system, that tends to reduce the amplitude of oscillations of an oscillatory system). Set of 3.

By adjusting the damping you can
“dial in” the response and feel of
the trumpet to your liking.