Eastman 520 series Bb trumpets
The 520 series is Eastman's advanced Bb line. These trumpets feature a hand-spun, hand-engraved bell.
Yellow brass---the standard alloy in trumpet bells---has the lowest copper content and is associated with bright, brilliant tone. Gold brass contains more copper and allows richer timbre, but does not support powerful playing and loud dynamics as well as yellow brass; gold brass is a good compromise between yellow brass and red brass, which has the highest copper content and is often used in flugelhorn bells.