I am not able to use cotton, it irritates my throat. I have tried organic, but since it is bleached with hydrogen peroxide I tried boiling it in case that was the problem. Still irritated my throat. I ordered some unbleached natural organic cotton, still can't use it. I went back to Silica, 32 gauge A1 Kanthal wrapped 4 times around doubled 2mm silica ended up at 1.6 ohms. I shoot for 1.5 but 1.6 is fine. I keep reading threads about coil builds and it seems like everyone has switched to micro coils and/or compressed coils and cotton. I love the compressed coils and cotton, so easy to rewick yada yada yada.... but it is close to impossible to thread silica through them. I tried taping the end (like the end of a shoelace) but it didn't work. I tried a needle threader, that cut the silica, tried same basic idea with a piece of thread, still cuts the silica... I am thinking I should be happy with my wrapping around silica, its working, tastes good, but....the neat tidy look of those compressed coils looks so nice. In reading all the coil threads and wicking threads I keep seeing people mention the Rob Coil, but no link or picture. So......what is it? Inquiring minds want to know