AR Resonance Flugelhorn Mouthpiece. - Top: ML FL 42 (Medium V cup, rim equivalent to Bach 1.5C, 42 throat) - Under: FL 42 L (42 throat, Large backbore, Yamaha shank) Purchased on Mercari in March 2025 and test-played, but the rim didn't personally suit me, so I've kept it in storage. This is a used item, so please understand that no claims or returns are accepted.