Bach Trombone Mouthpiece 6.5AL

• 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