The ce2 cartos are tankomisers, per say. Some love em, some hate em. I havent used one myself, but they are small for 510
batteries. Tankomisers in general were designed for
mods, and there are a few variations. But all of the above can be a challenge for anyone that doesnt understand how e cigs work. Tread lightly starting out with those, and watch a lot of youtube to help familiarize yourself with them, as well as trolling the forum for info about them. Not recommended as a first e cig setup.