Ferguson L mouthpiece for bass trombone. This mouthpiece is designed based on the Minick L mouthpiece. The inner rim diameter is equivalent to Bach 1-1/4G or Schilke 59, and the rim width is relatively thick for a mouthpiece of this size. My personal impression is that the sweet spot for the sound is somewhat narrow, but when played correctly, I felt that a rich resonance could be obtained. There are minor scratches from use, but there are no major scratches that would interfere with playing.