Thank you for viewing. This is a custom-made tuba piston button manufactured by Yamaha. Compared to genuine parts, the button diameter is larger, making it easier to press and recommended for those with smaller hands. I purchased it a year ago, but I'm selling it because I replaced my instrument and can no longer use it. There are some scratches, but the front side is clean, and the high-quality Yamaha felt is still usable. There is no distortion in the screws. Set of 4 (with push-button felt) * Compatible with models YCB-822S, YFB-821, YFB-822LWS, and YFB-621.