Willie's Bass Trombone Mouthpiece VSDP (Very Special Douglas Purviance) MONSTER Blank Silver Plated SP, Large Shank ★Rim Inner Diameter: 28.80mm ★Throat Diameter: 8.10mm *This is a beautiful item, purchased new and only test-played a few times. A custom specification not found in the regular lineup. Signature model of Douglas Purviance. He is a bass trombone player who has been active in the Vanguard Jazz Orchestra and others. With Willie's largest class diameter and a heavy MONSTER shape, you can get a powerful and focused, tight sound. It's easier to handle than it looks, and the blowing feel isn't extremely heavy, making it a versatile specification that can be used for jazz, as well as orchestras and wind bands.