Ferguson L Silver-plated SP Bass Trombone Mouthpiece ★ Cup Inner Diameter: 28.1mm * Used item, purchased and test-played a few times. While there is a sense of use, the appearance is relatively clean. Equivalent to 1-1/4G, the mouthpiece feels slightly larger than the numerical value, with a wide rim shape. The cup is not extremely deep, and the weight provides a tight, focused sound. "Ferguson" reproduces the mouthpiece of Larry Minick, who was involved in the design of Conn trombones and was a development engineer for the inline valve system. It is not a mere copy of the original Minick, but has been updated to be easier to play, meeting modern needs.