Bach 16 Stradivarius Series Trombone Lacquer Yellow BrLightweight Slide .509-inch Open Neck 16 Stradivarius Series Trombone Lacquer Yellow BrLightweight Slide 509-inch Open Neck The 16 Series features a medium bore to allow even more options on sound color and versatility Equally at home in the symphony or the jazz ensemble with a light but powerful sound that will carry over the rest of the ensemble when needed The 16 Series features a medium bore to allow even more options on sound color and versatility Equally at home in the symphony or the jazz ensemble with a light but powerful sound that will carry over the rest of the ensemble when needed