Bb Ab Tromba di Commutazione Pesante D2H Boccaglio Berkeley con Incisione Monette LP
Mystery Bb Ab Switching Trumpet Heavy D2H (w/Extra Engrave Monette Leadpipes) BerkeleyWind just design this first one in the Wold's Special trumpet, can help you switch 2 keys (either Bb and C ) or Bb and Ab in half a second.