■ Trumpet Valve Stem, Piston Shaft, Finger Button Parts - Set of 3 Each ★ These are trumpet piston buttons and piston shaft accessory parts purchased from an online shop (not genuine Yamaha parts). ★ The stone color is onyx-style (black), and the receiver is silver-colored. The shape is round and regular. ★ Approximately 33 grams for the set of 3. ★ They were installed on a current model YAMAHA YTR4335GII, but it is unknown whether they can be installed on other Yamaha models, Bach, or other manufacturers' trumpets. ★ Please understand that we cannot offer a warranty or refund if the screw threads or the instrument itself are damaged due to forced installation. Please understand and take responsibility for your own actions. ★ We will ship via Japan Post.