The STBQ38YR features independent F/D/Bb/Ab European tuning with precision Rotax valves, offering a smooth, even response and exceptional control across all registers. Its .590” bore and 10.5” detachable-flare yellow or gold brass bell provide resonant depth with focused projection, while the European tuning system supports agile valve usage and reduced extended positions. A balanced, responsive platform for orchestral, ensemble, and solo performance.