The term 'COMPONENT BRASS' is composed of two crossword solutions: TUBA (4 letters) and ALLOY (5 letters). TUBA is a large, conical brass instrument that is part of the brass family of instruments. It is usually played with a mouthpiece and produces a deep, resonant sound. ALLOY is a combination of two or more metals, or a metal and a non-metal, that has been melted and mixed together. Brass is an ALLOY of copper and zinc, and is used in many components such as valves, pipes, and fittings.