cartomizer. The thing I like the most about the cartomizer is comes with is the floating 510 pin, but the inner design of them appears to be different from other cartomizers. They don't have much filler material, and I think that creates burnt hits sometimes, but another owner of this device says that you can use Boge or Smoktech 35mm non flanged cartos, and I think that will make it better.
What is interesting is that each component of this device plays better when they are matched up with other devices. The air flow on the Cartotank was better when I used it on my Vamo.