Excellent key cap key chain from the Portal series!
Carry around a part of Aperture Science with you.
Don't let it get destroyed!
It's an excellent key cap key chain from the acclaimed Portal video game series by Valve! The weighted companion cube is your friend. And you don't want your friend getting destroyed, so protect it by putting it on your keys! Get yourself this excellent Portal Weighted Companion Cube Key Cap Key Chain and carry around a part of Aperture Science with you everywhere you go!