This instrument is the choice of Jay Friedman, principal trombone with the Chicago Symphony Orchestra. An advanced production instrument, it is based on the Bach Stradivarius Model 42, one of the most popular professional trombones in history. This model features a lightweight gold brass 42 bell, large .562 bore lightweight handslide, T-valve, open wrap. With Stradivarius case and 6.5A mouthpiece.