Vincent Bach 1G Trombone Mouthpiece Large Shank (Bach 341-1G)Vincent Bach 1G Large Shank Bass Trombone Mouthpiece New The Bach 1G is one of the largest and most powerful bass trombone mouthpieces in the Bach lineup. With an extra deep cup and a massive 28. 00 mm diameter, it produces extraordinary power, depth, and breadth of tone. The medium thin, well rounded rim provides comfort while supporting endurance for extended playing sessions. Featuring a . 319 throat and the #800S backbore, the 1G delivers a broad,