■ Trumpet Piston Finger Buttons Valve Parts Set of 3 ★ These are trumpet piston button accessory parts purchased from an online shop. ★ The stone color is onyx-like black, and the receiving cups are silver-colored and round. ★ They were installed on a current model YAMAHA YTR4335GⅡ, but it is unknown whether they can be installed on other Yamaha models or other manufacturers' trumpets, such as Bach. ★ These are products from an overseas manufacturer, so the stone parts may have rough polishing and finishing. ★ The set of 3 weighs approximately 11 grams. ★ Image 4 shows an example of them installed on a J.Michel pocket trumpet. ★ Please understand that we cannot provide warranty or refunds if the screw threads or the instrument itself are damaged due to forced installation. Please understand and take responsibility for your own actions. ★ They will be shipped via Yu-Yu Mercari delivery service.