Good absorbent cotton. As others have said, remove the smooth outer layers and you're done. I haven't noticed any significant "break-in time" at all. Just as good as the expensive cotton you buy from local smokers and you get a lot more. Will definitely buy again if I ever get past the first pack. BTW, I use rda's profile grid and it's almost perfect for that. I will get at least four wicks per pad.
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