The jars are for expressing 'royal jelly' from the bug queen's corpse once you kill her. The stuff's better than Compound 18 for reinforcing your armour - and also makes it lighter *and* bumps up its camo bonus. *GREAT* stuff, get every jar of it you can... but don't try to apply it to items already coated with C-18, as the two treatments eat each other (and the armour).