Thank you for viewing. I used this for about a year, but I'm selling it because I bought a new instrument. It fits Yamaha piston buttons. The screw part seems to be slightly bent, but I think it can be used without any problems. Please purchase only if you understand that this is a used item. This is a lightweight push rod for piston tubas. This model omits the parts that cover the felt, maximizing weight reduction. The felt will be exposed, but this is the model that benefits the most from weight reduction.