This is a list of instruments by Hornbostel-Sachs number, covering those instruments that are classified under 111 under that system. These instruments are directly struck idiophones.
Two or more complementary sounding parts are struck against each other. Castanets Claves Clash Cymbals
References
http://www.music.vt.edu/musicdictionary/texti/Idiophone.html https://web.archive.org/web/20110605070024/http://www.let.uu.nl/~Rudolf.Rasch/personal/Muziekinstrumenten03.PDF http://www.wesleyan.edu/vim/svh.html
Notes