Yamaha YSL-691

Bore: .508"
Bell: 7-1/2" yellow brass bell has a bright, intense tone with high resonance and superb sonority.
One-piece bell
Detachable balance weight
Ultra lightweight nickel-silver outer slide
Hand-hammered one-piece bell
A one-piece bell has an axial (lengthwise) seam, making it a continuous extension of the instrument's material
Hand-lapped tuning slides
Laser-fused pluzuma welded bell
The YSL-891 has a compact, well-centered tone and quick response suitable for studio musicians.