Yes
Because they're made of brass.
Brass
Brass instruments do not have reeds, some woodwind instruments do.
because they are made of brass
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)
Seriously? No, seriously? The trumpet belongs to the brass family because it is MADE of BRASS, as are all instruments in the BRASS family...
They are not brass instruments. They are woodwind instruments.
Because it is a brass instrument...? Many instruments are made of 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.
With brass metal molded
Brass makes Brass instruments for example, the Tuba, trumpet, euphonium,and trombone are ALL made of brass