Bb/F/Gb/D Bass Trombone. This instrument features Bore .562" = 14,3 mm, Yellow brass bell Ø 10'' = 254 mm, Chrome-plated nickel-silver inner slides, Nickel silver outer slides, Hand rest, individually adjustable, Additional Eb/G slide, Clear lacquer finish, Original VINCENT BACH 1 1/2G mouthpiece and slide cream, Light weight case with rucksack assembly.