Here goes a cartomizer shopping guide for your reference.

With this diagram, even if you are a newbie to cartomizer, you can find your own suitable one. You can follow these steps below.

First, please decide which threading you want

Second, please choose the resistance you prefer

Then, please go the right capacity you like,

Fourthly, please select e-juice visible or invisible

And finally, you may find out the exact cartomizer you want from the picture below.