This is a mod I have been really excited about. Unlike pretty much every other mechanical mod, the 4nine doesn’t have a 510 connection on the top, rather you screw your atomizer into the mech so that the battery makes a direct connection with the pin on your atty.
This is perfect for you voltage drop junkies out there. It’s available with tubes for 18350, 18500 and 18650. These are available in Copper, Brass and Stainless. I personally really like the look of the stainless so that’s what I went with, however I may have to pick up copper and brass if all goes well!