Idiophone
Idiophone any instr. that yields a sound by its own substance, being stiff and elastic enough to vibrate without requiring a stretched membrane or strings. See: concussion idiophone, percussion idiophone, plucked idiophone, shaken idiophone, struck idiophone (100). Hornborstel, E. M. von, and Sachs, Curt. “Classification of Musical Instruments,” translated by Anthony Baines and Klaus P. Wachsmann, in The Galpin Society Journal, Vol. 14. N.p., 1961.