Remember back when flash memory hadn't been invented yet and sci-fi shows still used CD-type data storage modules?
I do. That's why I'm also using these micro CDs as props.
I got them from my fiancee actually, who got them from some conference she went to. They had an inside sticker/cover, but I pulled that off, using a damp cloth to coax off any bits that wanted to stick.
I think I'll probably have to put a makers' mark on them.