Roy Benson Bb/F-Tenor Trombone TT-242F Pro Series F-attachment 13,89 mm bore Yellow brass bell 8,5" Nickel silver outer slides Hard chrome plated nickel silver inner slide tubes F-attachment lever, ergonomically curved Lacquered finish Light weight form shaped case with rucksack assembly For many years Roy Benson wind instruments are the embodiment of innovative instruments in an astonishing price class. Together with professional musicians and well-known instrument makers the ROY BENSON Team sets new signs with innovative ideas for the players, to realize his musical visions.