This is the pen I use:
http://www.vapeitnow.com/products/eg...l#features-tab
Notice in the pic, inside the clear part, or the chamber, the string inside. That's part of the coil. Kind of like an old kerosene lamp, the string soaks up the juice to feed it to the coil. The string/coil is what's replaceable
Ok, enough post hogging by me, I'll fade into the background again