This is the Ultimate Brass mouthpiece, Koichiro Yamamoto model 3XD, for large-bore tenor trombone. I've used this as my main mouthpiece for several years in orchestras and solo performances, and I'm quite fond of it, but I'm selling it due to a change in size. * While the inner diameter is the same as a 2G, the feel on the lips is closer to a 3G+. * This is the deepest model in the Yamatenor 3 series, but it's not too deep compared to other American-made mouthpieces, allowing for high-note work. It gives a 3GM vibe. * It has a solid weight, providing a sense of security and stability. Recommended for: * American-style players with the stamina to blow powerfully. * Those who want to play the mid-range with a persuasive sound. * Orchestra players who usually play 2nd tenor and occasionally switch to bass trombone (vexel players). * Those who usually play bass trombone and are looking for a mouthpiece option when switching to tenor. * Bass trombone players who want to change the sound to a lighter feel in a small orchestra setting by simply changing the mouthpiece. *This mouthpiece is considerably larger than the average tenor mouthpiece, so it is not recommended for smaller players. *Price negotiations are welcome, but please include interesting stories related to the product, music, or anything inspiring, along with your enthusiasm. Discounts will be given based on how much your comment resonates. Offers with only a price will be ignored. (´ー｀) Anti-resale measures