Dioxide, you must have read a review on those strange looking round brass heads they're also selling to fit kanger subs... ?
Because I just looked, and there are zero reviews on the 1:1 clone OCC heads at fasttech.
Just a few discussions . Two for the 10 pack and one for the 5 pack.
I dont own a subtank yet, but I see no reason these wouldnt be just as good as the authentic ones, other than perhaps the clean blister packaging of the real ones. For less than seven bucks a 5 pack, imho they're worth trying out for yourself if you already have vapemail in mind to order from fasttech.
Or said another way, "If" these are wicked with organic japanese cotton like the real ones and "if" these have the same physical dimensions and same insulator material...and most importantly "if" you intend to eventually use these parts for your own rebuilding (recoil and rewick) than they're a bargan for rebuilding parts purposes at the very least.