Those are the actual resolutions of the images in the game, so they can't really be made any larger without looking really bad. So its sprites then? (They also mess up the article if they're bigger -- I hate empty spaces. And there really isn't more to write about the Instruments)
Aeronflux– It's my timey-wimey detector. Goes ding when there's stuff. - The Doctor TALK– EMERGENCY TEMPORAL SHIFT!
Sprites, definitely. Couldn't one possibly obtain larger images by using an emulator on a computer?