The Bach Stradivarius 43 Bb Trumpet uses the popular Bach #43 bell that has a slower taper to produce a brighter sound. The "Lightweight" model uses a lighter metal to create a trumpet that produces freer vibrations, making the instrument respond more freely in all registers. This combination offers the player an instrument that is well suited for use in jazz when a player is spending a long time in the upper register and needs to produce a slightly brighter sound without the additional work.