Model #5391 Bellflex / Model #5392 Copper

Technical Specifications:
Bore: XL (11,90mm/0.469")
Bell: #27 (125mm/4.92")
Bell material: Bellflex or Copper
Leadpipe: #1 REVERSE
Tuning slide: Square 
Valves material: Monel
Valves section: Yellow brass
Trim kit: Titanium
Trigger on 1st slide
4th valve slide F
Finish: Silver plated 1000 thousandth
Mouthpiece: 3C Classic
Upon request: Gold plated finish

INNOVATION AND EVOLUTION
Due to the evolution of the repertoire, it was more and more required to develop and broaden the register of the trumpet, not only to play new concertos, but also to play arrangements of pieces originally written for other instruments. 

The fourth valve expands the register a fourth below the low F sharp. It also gives the possibility to use different fingerings that are of a big help to the performer in different occasions.

Furthermore, the fact that it has more mass and tubes, along with the XL bore, produces a huge sound that will never break, and is stable in all registers.

More videos of the Stomvi Titán Bb 4 valve edition on the link: