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. this trumpet come with 2 leadpipes, one is Rotary valves switching leadpipes another is beautiful engrave Monette style leadpipes. it's pretty and make more intonation for smooth tone. also come with D2H heavy jazz darker mouthpiece. i do try using cornet flugelhourn mouthpiece. it's a amazing design.