Online I found some info. "A brass instrument is a musical instrument whose tone is produced by vibration of the lips as the player blows into a tubular resonator. They are also called labrosones, literally meaning "lip-vibrated instruments" (Baines, 1993)." Hope this helps!
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brass instruments can be made of silver, brass, or even plastic in some cases, although not intirly plastic. brass instruments may also be made of solid gold or coated in it, and mouthpeices can be made of brass, silver, plastic, gold or gold plated.
Because they're made of brass.
because they are made of brass
brass
Brass instruments are, as the name suggests, made out of brass. They are then either lacquered, or silver plated, depending on the player's preferences.
Tubas are made of metal, frequently brass, hence the name "brasswind" (trumpets, trombones, tubas, etc). This is as opposed to "woodwind" (like flutes and clarinets)