What are stringed instruments made of?
Depends on what intsrument you're talking about. Guitars are generally made of wood and goat strings, same as bass and piano, which is also a percussion instruent is also made up of metal and other strings. Hope this h elped somehow.
For one thing, "string instruments" and "stringed instruments" are not the same. String instruments are the viol family and stringed instruments are any instrument that has strings. The piano and harp both qualify. Now, the piano is a percussion instrument that has strings and the harp is an unbowed stringed instrument.