Carol Brass CTB-6229-YSS-YNNN-N3, Bb/F-trombone, open wrap, bore: .547" (13,90 mm), 8,5" (216 mm) brass bell (standard), nickel silver handslide, interchangeable leadpipes, clear lacquered, incl. ABS plastic case, 6 1/2 AL mouthpiece, 4 different leadpipes