Rattle (percussion beater)

A rattle is a percussion beater that is attached to or enclosed by a percussion instrument so that motion of the instrument will cause the rattle to strike the instrument and create sound.

Examples include:

Rattles may be the primary cause of the instrument's sound, as in the maraca, or they may modify its sound, as in the sizzle cymbal, or they may be used for both purposes depending on how it is played, as in the tambourine.

Ball chain surrounding the cabasa produces its sound when it is shaken

Rivets in a swish cymbal modify its sound

Tambourine jingles both sound when the tambourine is shaken and modify the sound of the hand beating the skin

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Wikipedia