Bach Professional Bb/F Tenor Model 42B Stradivarius Tenor Trombone w/F AttachmentStradivarius Tenor Trombone w/F Attachment"Stradivarius" - Bb/F, .547" bore, 8-1/2" one-piece hand-hammered yellow brass bell, chrome plated nickel-silver inner handslide tubes, brass outer handslide tubes, traditional wrap "F" section with traditional rotor, clear lacquer finish, genuine Vincent Bach 6-1/2A large shank mouthpiece and zippered Cordura covered wood shell case