This is a Helleburg mouthpiece from CONN. I bought it two years ago, but I'm selling it because I haven't been using it lately. I've only used it a few times since I bought it, so it has few scratches and looks very clean. ↓ The following is quoted from the TUBAMANPlus sales page: This is a mouthpiece with a very long history, said to have the highest cumulative sales in the world, and is representative of the American style. This model, named after August Helleberg, who was active in the early days of American tuba players, captivated artists across the United States with its soft, dark tone and excellent breath support, greatly influencing the American tuba sound. In the last few decades, with the exchange of information around the world, not only this Helleberg model but also mouthpieces developed based on this model have spread not only in North America but also around the world, gaining a wide range of users from top professionals to enthusiasts. *Helleberg For B.C. tuba Inner rim diameter: 32.8mm Throat diameter: 8.3mm Finish: Silver plated Cup: Very deep V cup Shank: American