B&S MS14KN-L Bb/F-Trombone, Bb/F Trombone, B&S ‘Meistersinger' series, 'Stolzing' model, Bore diameter: 13.89 mm, Quart valve bore diameter: 14.5 mm, Bell diameter: 230 mm, Outer slide made of nickel-silver, Inner slides of nickel-silver, Red brass bell with nickel-silver rim, Gold-brass bow, Interchangeable brass leadpipes, Lacquered with clear varnish, F-Valve with 3B joint system, Asymmetrical arches on the main tuning slide and on the quart valve, Includes mouthpiece, In lightweight softpack case, The trombone slides with extended pulls to increase running characteristics and stability in 5 to 7 positions, All B & S