Schilke 60 Silver Plated SP, Large Shank Standard Series Bass Trombone Mouthpiece ★ Cup Diameter: 29.03mm ★ Cup Depth: Deep * Not a long shank ★ Purchased new, used only a few times for testing. Almost no signs of use, like new. This is a standard model favored by many bass trombone players, known for its thick and powerful sound. Schilke mouthpieces have subtle differences in shape depending on the manufacturing period, but this one is a relatively recent specification.