It is because in order to play a brass instrument you need to vibrate your lips in order to play notes.
the trumpet is made of brass or sometimes silver.
The trumpet is a brass instrument, not a woodwind instrument.
The trumpet has no reeds. It is a brass instrument, which means the mouthpiece is a single piece of brass.
Seriously? No, seriously? The trumpet belongs to the brass family because it is MADE of BRASS, as are all instruments in the BRASS family...
A Trumpet is from the Brass family.
The Flute is in the Woodwind section/family and the Trumpet is in the Brass section/family.
It's made of brass
If I understand your question correctly, there are many different types of trumpets including (but not limited to) a Bb trumpet, C trumpet, D trumpet, Eb trumpet, Piccolo trumpet, flugelhorn, pocket trumpet, cornet, natural trumpet, rotary trumpet, and many other various styles and families of a trumpet. More can be researched on different websites that specialize in answering this question as well. - Basically BRASS
A Trumpet is a music instrument that is a member of the brass family. The sound of a trumpet is called a taratantara.
brass
Brass.
brass