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. It is also the most sought after trombone for lead playing because of its sound, all around playability, and ease of response.