Bach Artisan 1G Bass Trombone Mouthpiece Silver Plated ★Only tried a few times, in excellent condition. Although there are very small scratches overall, the appearance is almost new. ■Diameter: 28mm ■Cup Depth: D (Deep) ■Rim Thickness: MT (Slightly thin), quite a round rim. The Artisan model's shape is based on the early 1940s and 50s models, using specially selected throat and backbore. The very large and deep cup achieves a deep and powerful sound.