Crap, I use Xc with a piece of cotton pulled through the center of it..........I use cotton for all sorts of rebuilds, gennys, Kayfun, killer, protank. So long as there is juice I never singe. I only use fiberbiuos cotton like from balls and face pads, I can't get the square wick stuff to....well wick. So long as I do my part and not choke the wick so it expands I get zerro burn. The only reason i put it in the Xc is to fatten it up and make wrapping a coil on it easyeir
Sorry misread the title, I'm using XS not XC. same material I think, just ones hollow and the others solid