The BT 1 compares to a conventional Bach 1G/Schilke) 60 size, and it is great for bass trombone players looking for a huge, broad sound. The rim contour is wider and more comfortable than conventional bass trombone mouthpiece, many of which have very narrow rims. The upper register is surprisingly easy when the player stays open and relaxed! The BT1 is also available as the BT 1L, with an large throat. This first model of Monette orchestral bass trombone mouthpiece was developed for John Englekis...