The Horn Guys is closed due to fire and smoke, I'm shipping later in September. Please contact me by email. -Steve
Kanstul 2-Piece B-Series Trumpet Mouthpiece Backbore
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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