This is a model with a larger inner rim diameter than the HR-30B17.27/3.9029B, and is a representative V-cup model. It has a smooth airflow, making it ideal for instruments with a narrow bell. This is a "high-tone specification" mouthpiece with a slightly smaller rim diameter and a narrower throat. It's similar to an Alex 8F, but the blowing feel is superior. This is being sold to clear out stock. It has only been used for practice a few times. There are some minor scratches from use, but the overall condition is good. It has not been kept in the mouthpiece case of the instrument case to prevent scratches.