V. Bach Artisan 1-1/2G Bass Trombone Mouthpiece Silver Plated SP, Large Shank ★This is a beautiful item, only test-played a few times after being purchased new. The appearance is almost like new. ■Diameter: 27mm ■Cup Depth: D (Deep) ■Rim Thickness: MW (Medium Wide), quite a rounded rim. The Artisan model's shape is based on the early 1940s-50s models, using a special throat and backbore. A slightly heavier body is combined with the 1-1/2G size, resulting in a deep and powerful sound.