Assertion: keyboard instrument's string | /r/MadeOf | metal
Facets:
value: almost always
type: TEMPORAL
value: for electric guitars
type: PURPOSE
Source sentences:
text: For electric guitars, strings are almost always made of metal, and the pickup works by electro-magnetic induction (these are called magnetic pickups; they are the most widely used type of pickup on electric guitars).
text: Stringed instrument , any musical instrument that produces sound by the vibration of stretched strings , which may be made of vegetable fibre, metal, animal gut, silk, or artificial materials such as plastic or nylon.