I play a Taylor flugelhorn with a very thick copper bell. It is very heavy, and plays with an extremely dark, warm sound. I play a Schilke B5 Bb trumpet that also has a copper bell, albeit silver plated. It is not noticeably heavier than other Schilkes that I've played, but it does have a slightly darker sound, particularly when I play it softly. Both of these horns are intended by their makers to lean to the dark side, so to speak.