Blessing BTB-1547T F Attachment Trombone BTB-1547TRS Silver Red Brass . . . The Blessing BTB-1547T is a professional tenor trombone with an F attachment Features include a 547 primary bore, 562 F-section bore, special annealing method, red brass outer hand-slide tubing, and a nickel-silver hand-slide bow The BTB-1547T is available with an 8-1 2" yellow or red brass bell Finish options include a choice of lacquer or silver Comes with case and 5G mouthpiece