Puedes prestarme tu carro por favor?
I believe the company that makes these is PerpetualKid.com, but I'm not certain. They are available at all sorts of novelty shops, and I must order a set! My girlfriend has a set of owl key toppers, so I have to match her with something even more cool!
You simply slide the masks over the top of the key, then slide them back on your key ring, and you'll be set for a battle royale! Neither faces are copyrighted characters sadly, but they are pretty fun! Could you imagine a set of Santo, Blue Demon, y Mil Mascaras keys?