Those things are almost certainly liquid fuel lighters. The fuel evaporation probably defeats your purpose in wanting such a tiny lighter, namely that you're hoping to stash it someplace where it won't need any space or attention. There are some butane lighters that are the same size as a standard cigarette (intended to carry in a cig pack along with your smokes) and those aren't so hard to find. That might be a better bet.

If you're completely insane it might even be possible to cut one of them down to a smaller length (or similarly with a Bic Mini), re-sealing and re-filling it somehow.