We love us some knife lube. And the Sentry Solutions Tuf-Glide lube is some of the best out there, particularly in the Pen configuration. It's the size of a Sharpie, and the stuff has lived on mugs on our desks for years. It also fits perfectly in a knife maintenance kit. The tip has a needle applicator for easily lubing up the pivot and detent of your knives. A couple drops do the trick nicely.
Size: .25 OZ (7 ml). Arrives in a sealed zip top poly bag. Plus this thing features a pen clip so you can keep it in your pocket protector. You know you want to.