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Small shank mouthpiece. Perhaps the most popular medium-large mouthpiece for trombone or euphonium. Identical rim and cup to the 6.5A, but with a slightly?larger?420 backbore and "G" throat than the small shank 6-1/2A.
?? 25.40mm diameter rim
?? Medium-deep cup
?? Medium-wide, well rounded rim shape.
?? 0.261" throat
?? 420 backbore
Bore size comparisons:
Bach 6.5A Small Shank = 0.2283"
Bach 6.5AL Small Shank = 0.261"
Bach 6.5AL Large Shank = 0.261"
Bach 6.5A Large Shank = 0.276