Brass Lab.MOMO Large Bore Trombone Mouthpiece VL 49L The VL series is a lightweight model unique to Brass Lab.MOMO that combines good response with a core sound. Generally, heavy mouthpieces produce a solid sound with a sense of weight, but they can be tiring to play for long periods. Lightweight mouthpieces are easy to blow and comfortable for long performances, but they lack a core sound and tend to resonate. Brass Momo's VL series was researched and developed to solve these problems. While being a lightweight model finished at about 2/3 the weight of conventional MOMO products, the application of MOMO's unique technology, "acoustic processing," allows for a responsive and light playing feel, while still achieving a core sound that can be projected to the far reaches of a hall. It is attracting attention as a mouthpiece that allows you to efficiently play your instrument with less effort. Size Details Model: 49L Cup Inner Diameter: 25.4 Cup Depth: Medium Throat Diameter: 6.8 Features: Easy to handle and a popular model *Similar to Bach 6-1/2AL I am selling this to organize my equipment.