3416HA Bach 6.5A Large Shank Trombone/Euphonium Mouthpiece
SLarge shank mouthpiece with an identical rim and cup to the large shank 6.5AL, but with a slightly larger bore (0.276 vs. 0.261 inch).
• 25.4mm diameter rim
• Medium-deep cup
• 0.276" throat
• 429 backbore