Bach Stradivarius Model 37: The Bach 37 is a professional-level Bb trumpet that is known for its warm, rich sound and excellent intonation. It features a .459" bore, a one-piece bell, and a reverse leadpipe.
Bach Stradivarius Model 43: The Bach 43 is a step-up trumpet that offers many of the same features and qualities as the 37, but at a more affordable price. It has a .459" bore, a two-piece bell, and a standard leadpipe.
Bach Stradivarius Model 180S37: The Bach 180S37 is a C piccolo trumpet that is known for its clear, focused sound. It features a .438" bore, a one-piece bell, and a reverse leadpipe.
Bach Stradivarius Model 18043S: The Bach 18043S is a step-up C piccolo trumpet that offers many of the same features and qualities as the 180S37, but at a more affordable price. It has a .438" bore, a two-piece bell, and a standard leadpipe.
Ultimately, the best way to decide which Bach trumpet is right for you is to try out different models and see what feels and sounds best to you.