Description Stomvi Harmonic Sound bottom caps have a resonance chamber creating a unique harmonic characteristic that can increase response and playability. Stomvi Harmonic Sound bottom caps can give you: Increased resonance An easier upper register Better response Improved slotting Better flexibility Stomvi Harmonic Sound bottom caps can enhance the performance characteristics of your instrument with increased resonance allowing the player more dynamic expression. Better connectivity, response, and slotting along with improved sound make the Harmonic Stomvi an excellent replacement for standard bottom caps. Available for Stomvi, Schilke and Conn Vintage One trumpets in silver, brushed lacquer and gold.