This is a cornet mouthpiece. It makes the low register easy to play and features a deep sound. I bought it a year ago but only used it a couple of times and have been storing it. It comes with an Alliance mouthpiece pouch. Price negotiations are welcome. 【 Richard Marshall Model 】 This mouthpiece was supervised by Richard Marshall, principal cornet player of the world's top brass band, "Black Dyke Band." With a slightly weighted and unique design, it allows for a stable tone across the entire range. Rim Inner Diameter: 17.00mm Throat Diameter: 4.50mm Cup Depth: Deep Equivalent to Denis Wick 2 Retail Price: ¥22,000 (at a certain musical instrument store)