Editing Trombone (section)

=== Bells ===
Trombone bells (and sometimes slides) may be constructed of different [[brass]] mixtures. The most common material is yellow brass (70% copper, 30% zinc), but other materials include rose brass (85% copper, 15% zinc) and red brass (90% copper, 10% zinc). Some manufacturers offer interchangeable bells. Tenor trombone bells are usually between {{convert|7|and(-)|9|in|cm|abbr=on}} in diameter, with most being between {{convert|7+1/2|and(-)|8+1/2|in|cm|abbr=on}}. The smallest sizes are found on jazz trombones and older narrow-bore instruments, while the larger sizes are common on orchestral models. Bass trombone bells can be {{convert|10+1/2|in|cm|abbr=on}} or more, with most being between {{convert|9+1/2|and|10|in|cm|abbr=on}}. The bell may be made from two separate brass sheets or from one single piece of metal, hammered on a mandrel to shape it. The edge of the bell may be finished with or without a piece of bell wire to secure it, which also affects the tone quality; most bells are built with bell wire. Occasionally, trombone bells are made from solid [[sterling silver]].