Glaygo Brian Hecht 1.25 Not for individual sale This is the artist model of Brian Hecht, trombone player for the Dallas Symphony Orchestra. It is the Orchestral O, Audition A, and Recital R models. Inner diameter is 27.5mm, the throat size is unknown despite research. Since the O model was used mainly, the A and R models are in almost new condition, having only been test-played. There are scratches on the shank from use.