I used a prewrapped coil that came with it, but wicked it myself. Surprised by how well its working, factory juice channels still, using 60 pg juice and wicking better than stock .5 coils. Taste seems a little better too. Seems like its hotter than stock coils so I'm running it under 15 watts, coil reads as .6 on my istick 30wt. I didn't think I'd get into rebuilding but now I'm rethinking things. Might start looking into an a real rta. Any suggestions for an rta with as much airflow as possible for sub ohm coils for a beginner?