The S.E. Shires Custom Series Professional Bass Trombone offers you a versatile instrument with exceptional tone and playability. Its unique B11 7YM yellow brass bell provides a quick response and rich tone, combining the focused sound of a one-piece bell with the expansive resonance of a two-piece bell. The BII taper produces a warm, balanced sound across all dynamics. The axial-flow valves offer an open, even feel through the low register, especially when both valves are engaged. Experience the clarity, projection and flexibility that have made S.E. Shires trombones the choice of professionals worldwide. Discover the Custom Series Professional Bass Trombone's superb craftsmanship and incomparable tone for yourself.