It's an Item in a game called Team Fortress 2.
Oh, I knew what the game was. I was just wondering about the keys. I've gotten a lot of drops but none of those! :p.
Here's a really good explanation of what they are, and they can't be dropped, they must be be bought.
http://wiki.teamfortress.com/wiki/Mann_Co._Supply_Crate_Key
Ahhh, thanks! So that brings up a question, then. Why would someone sell for $1.80 if they bought them for over $2? What would be the incentive?
I have no idea, maybe they are bought with stolen credit cards and hacked accounts?
and the value of BTC is greater than pp, as you pay an exchange rate.