* Key: Bb * System: Compensating * Finish: lacquer, silver and silver with gold trim * Piston: Stainless steel pistons (3 on top, 1 on side): smooth valve action & no oxidization * Slides: Inner & Outside both nickel silver * Lead-pipe: Yellow, red, gold brass, nickel, convertible * Body/Bell Material: Yellow brass * Nickel silver tuning slides : corrosion resistance * Bell Size: 312mm(12.28") * Bore Size: 15.00mm-16.80mm(0.591"--0.661" dual bore) * Bell Diameter: 12 1/4" * Case: Wisemann Case * Mouthpiece: Included * Features: a main tuning slide trigger and guard, bell rim rolled and soldered over brass bell wire to add strength and protection.