This is a popular size for B6LS1. Prana models are common, but the classic model is rare, so I think it's valuable. I mainly used it for the lead in a big band. Compared to PLANA, the shank end is thicker, giving a crisp, solid sound. Also, the backbore is close to standard, making it easy to control. Equivalent to a Bach 5C-3C size. It's easy to control both the high and low registers, making it a well-balanced piece. The rim feels comfortable on the mouth, reducing fatigue, and the response when playing is very good.