I use cotton cheesecloth wicks in my Ithaka, as I do with my Penelopes, Kanger T3s, Vivi Novas, and ProTanks. I find that 45-thread wicks work a treat; duals for the Ithaka and singles for the Penelopes. I prefer the taste (or should I say, non-taste) and transparency of cotton wicks, and cheesecloth works very well for long-run wicks like the Ithakas and Penelopes. For things like the Kayfun Lite, plain cotton ball wicks work excellently and are easy to replace inside an existing coil.