Can't say on the sizing, but I bought a couple packs of the pre-made coils and didn't like 'em, I believe the material may be suspect rather than true A1 Kanthal - they'd gunk up quicker than homemade wires using the same juice, and you could only maybe dry fire and re-wick once before they were shot. With my coils, I can dry fire and re-wick a couple times a week and sometimes keep the same coil going for a month...with the advent of the new coil-winding tools making an already simple task foolproof, I don't bother with the pre-mades any more. My wife keeps a few in her purse in case she has some need to rebuild her RDA *right now*, but that's about all we've used them for...