AR Resonance I am offering a backbore for a euphonium mouthpiece. Compared to brass or bronze, nickel produces a clear, brilliant sound with well-defined contours, and is relatively easy to control. The finish is raw (unplated), so it has a straightforward tone and responds quickly. (※The above are purely personal impressions. Please refer to the manufacturer's website for details.) Thank you for your consideration. Product Contents: Backbore only for a large-shank euphonium mouthpiece Material: Nickel Finish: Raw (unplated) Size: M size (M72E) ※Box and leather case are not included. There are no particularly noticeable scratches or dents, and the condition is excellent. However, it is strictly a used item and has scuffs and discoloration from use. Please only consider purchasing if you understand this. Reference: Please refer to the information from the domestic general distributor for current prices and product descriptions. https://trumpet-store.jimdofree.com/a-r-トロンボーン他マウスピース/ Especially since prices are currently soaring, I believe this is a great deal. #Euphonium #AR Resonance #AR Resonance #Mouthpiece #Backbore