What is this mysterious metallic cylinder?

I found it hiding in my stack in this tube:

Let’s pop the top:

Oh, hello there kitty. Its ok. Come on out. You’re safe here.

My, you’re a big kitty.

Oh, there are more of you

Let’s get a closer look each of you

One of the backs:

I don’t think I had realized that the backs had lettering

And that’s where we’ll say goodbye. I am allergic.

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