Pins? Probably.
Here are some silver-tone (likely steel or aluminum) flat metal items with raised details. These are from Wonder Fest in Japan in 2017. These are likely booth prizes of some sort, or some kind of convention exclusive. Texture & raised surfaces are used here to show the details of the design. There are 2 emblems from either an anime or a video game (wing knight skull, unicorn face with hair) and also SA1's "Circle Sonic" where he was walking with his hands in odd/twisted positions that you don't commonly see. What are these actually, and how were they obtained?