They are just reg plain cartos. Yes you fill them with liquid and vape with a drip tip. You have to fill them often. About 5-8 puffs, depending how deep of a hit you take and how long. They are "old school" one of the first on the market. There are 2 standard size single coil and 3 ex long Duel coil (better for higher volts 3.8-4.0 volts) I love to use them for trying new flavors. Instead of filling a tank with a new eliquid and finding out you don't like it and waste all the liquid and heads. I fill one of these with about 1/2 -1 ml and hitting it a few times. I would send a pic but it's late and I am tired. If you are still unsure I can do the pic in the am.