Assertion: vibraphone's bar | /r/MadeOf | metal alloy
Facets:
Source sentences:
text: Xylophone has bars made of wood, usually rosewood and played with rubber, plastic or wooden mallet; vibraphone has bars made of metal alloy, usually aluminum, and played with mallets covered in corn or yarn and are usually mushroom-shaped.
text: The bars are made of a metal alloy, usually aluminum.