V. Bach Artisan 1G Bass Trombone Mouthpiece Silver Plated ★This item is in excellent condition, having been purchased new and only test-played a few times. The exterior is almost as good as new. ■Diameter: 28.0mm ■Cup Depth: D (Deep) ■Rim Thickness: MT (Slightly Thin), quite a rounded rim. The Artisan shape is modeled after the early 1940s-50s era, using specially selected throat and backbore. The very large and deep cup achieves a deep and powerful sound.