Assertion: stringed instrument's string | /r/HasProperty | struck by small hammers
Facets:
value: to make their sound
type: PURPOSE
Source sentences:
text: Keyed instruments, such as the piano or harpsichord, are composed of a series of hidden strings that are struck by small hammers when the appropriate key is pressed, which results in a clear, ringing sound with bright overtones.
text: Well, it does have strings, 88 of them, but most experts consider it a percussion instrument because of the way the strings are struck by small hammers to make their sound.