AR Resonance Euphonium Mouthpiece Backbore. Made of brass, it tends to be easier to control compared to, for example, bronze. Thank you for your consideration. Contents: Backbore for Euphonium Large Shank Mouthpiece Material: Brass Finish: Silver Plated Size: L size (L72E) ※Box and leather case not included. There are no noticeable scratches or dents, so the condition is good. However, since it is strictly a used item, please consider purchasing only if you understand this. Thank you for your consideration. Reference: Please refer to the information from the domestic general agent for the current new price and explanation. https://trumpet-store.jimdofree.com/a-r-トロンボーン他マウスピース/ #Mouthpiece #Backbore