Keep finding tiny pieces like this on the floor. It’s hard and sharp, and I can’t figure out where they came from. They’ve got brown and black stripes. What’s it from?

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This is a long shot, but I’m hoping someone will maybe be able to figure out where they all came from.

​Keep finding tiny pieces like this on the floor. It’s hard and sharp, and I can’t figure out where they came from. They’ve got brown and black stripes. What’s it from?