I don't know if this is a car part or something else, but because I found these laying near the entrance of my garage I thought I would start here.
The pieces feel metallic on what I consider the top (where the engraved "O" shape is) and is attached to some kind of soft, flexible backing. The two pieces together are connected by this backing and they fold up. The single piece is facing down and showing this backing. The single piece measures about 0.75" x 0.6" x .125"