Preparing to move, I found this together with the papers I got when I bought my bike. But what is it? Is it important?

what is this?

It is about 2cm long.

I have four of these... Maybe related to the disk brakes? I was hoping they could be pad spacers, but that might just be wishful thinking.

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    Even though its a perfect duplicate, I still learned something. Welcome to the site! – Criggie Aug 7 '18 at 19:45

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