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The Marcus Bonna order for (late) December delivery is fixed.

Kanstul 2-Piece B-Series Trumpet Mouthpiece Backbore

$15.99 $65.00

Item Details

Here are remaining sizes of threaded backbores for 2-piece Kanstul Bach-style mouthpieces. Matching cups are available here.  Numbers correspond to standard Bach dimensions.  In silver plate, limited supply.

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