Bach Stradivarius 190S37 Trumpet - Silver PlateThe 190S37 is built on an ML . 459" two piece valve chassis with nickel balusters, nickel outer slides, and brass valve guides. The Mt. Vernon weight, side seam #37 bell with a round steel wire bell bead is paired with the classic #25 pipe for what can easily be considered the classic definition of the Bach sound. The wide wrap nickel Z braces, a new design, and 1st slide brace give this 37 a rich, vibrant sound that is broad, brilliant, and agile.