They are spare grill covers...
ya know, for the hip-hop crowd.
Picture it, yer on stage, yer rappin' to the beat and one of your gold crowns gets beat-boxed right out your fool head into the crowd.
now ya can't go on without a gold grill cover, so you reach down and pull out the Blackberry 8800 and take out your spare golden grill cover.
yer set, the show is saved and you did it all with your BlackBerry!