Ribbons with mirror finish wedged in packets (9)

I believe the answer is:

streamers

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'ribbons' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for streamers that I've seen before include "Decorations which flow out in the wind" , "Long, narrow coiled decorations, unroll when thrown" , "Ribbons in the wind" .)

I've seen this clue in the Sydney Morning Herald.

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