Really like Cotn brand cotton. Super clean with no off taste. These threads makes for quick easy wicking. On shorter coils I cut them in half and save the other half for later. The only con is that it is not thick enough for the way I like to wick exotic coils. For regular round wire 3mm coils this works but with 3mm exotic coils you will get spit-back because it is not thick enough. Works fine with all my 2.5mm coils, round wire or exotic wire. Eciggity kicks butt with fast shipping and great prices!