Although technology has allowed for the creation of plastic trumpets, many professional trumpeters still prefer the ones made of high-quality brass sheet metal due to the better range of notes of the latter. Generally, this is something that is influenced by your manufacturing method. As for durability, using a yellow brass channel (70-30 copper to zinc ratio) from an established supplier like Rotax Metals should go a long way in guaranteeing the longevity of the instruments you manufacture.
http://rotaxmetals.net/from-brass-sheet-metal-to-instrument-advice-for-trumpet-manufacturers/
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