Which percussion instruments are played by striking two objects together?

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Sound is produced by two parts striking each other when we talk about concussion idiophones. This category includes instruments where the sound comes from collision of two objects, such as clappers or castanets. The key idea is the production method: sound results from a direct impact between two pieces.

That’s why the best choice is the category name concussion idiophones. It describes the mechanism across instruments that work this way, not just a single instrument. In contrast, glockenspiel and xylophone produce sound by mallets striking bars, not by two pieces hitting each other, so they belong to a different group of mallet percussion.