The cartridge is actually made up of the mouthpiece (the part you see
on the end of the electronic cigarette...much like the "filter" of a
tobacco cigarette) and the cartridge. The cartridge is a small plastic
cup inside of the mouthpiece. Inside the cartridge is polyester batting
that acts like a wick to hold the e-liquid. You can fill the cartridge
while it is still in the mouthpiece or if you prefer you can take a
needle or toothpick and stick it through the small hole in the
mouthpiece. This will push the cartridge out of the mouthpiece, which
can then be refilled with the eliquid. Please do not take the wick out
of the cartridge as this will break the seal and then the wick can fall
onto the atomizer when using, destroying your atomizer. Refilling is as
simple as dripping a couple drops of ELiquid using the dropper onto the
polyester wick. Then just slide the mouthpiece back onto the electronic
cigarette and you are ready to e-smoke!