They are push pins. They're clear. They work like push pins. What more is there to say other than don't push them into people. It turns out that they scream quite loudly when you do that. So much noise for one little prick of the skin.
We used the clear push pins to attach the title cards to the wall for a photography show. They held up very well even when we needed to hit them with a hammer to get them into the wall.