Shires K Serie STRK10S Bb TrumpetSTRK10S A responsive and versatile Bb trumpet, the K10S trumpet delivers the clarity, projection, and effortless playability that musicians need as they refine their sound. Its yellow brass, two piece bell helps produce a vibrant, centered tone with impressive resonance and control. The . 459 bore instrument with smooth, reliable Monel pistons support clean, consistent articulations, giving the instrument a polished and confident voice. Featuring a .