those are stickers....
got them whne i was in Japan, they're suppose to be for the TOMY Aero R/C cars (which i also bought..hehehe.. they were cheap!)
the sticker set has some nice Japanese Tuner Brand names on them,
i thot they wld be pretty cool on the Japanese diecast cars..heh
i also added some stickers to my BugEye WRX, very minimal though. don't wanna go overboard with the stickers