Delivering a rich, full tone in the way only a Stradivarius can. The Bach 36 Series Trombone features a.525-inch bore and an 8-inch one-piece, hand-hammered bell for outstanding resonance and projection. The Bach 36 is a perfect choice for a high-performance medium-large tenor trombone without an F Attachment. It is also the most sought after trombone for lead playing because of its sound, all around playability, and ease of response. The open wrap on the 36BO opens up the sound for a freer blowing experience.