@PeterKay what tank, wattage, juice, and coil are you using? I personally haven't used silica in over 6 years, but I could with my set up. I basically am using the same set up now than when I started over 8 years ago, an rta with 28 to 26g kanthal at 20ish watts and 70vg juice, but if your a 30 or higher watt guy that uses 100vg and perhaps dtl inhaling , silica is not going to work.....you really need to be vaping over 1 ohm with 28g to 26g spaced coils at 20 or lower watts mtl and no more than 70vg juice . Yes, if your good you may get away with slightly higher numbers, but not by much......you also would wrap the wire around the wick (which isnt hard) then attach that to the posts, which is slightly more tricky than just mounting a more traditional coil with no wicking material . Also silica is fairly thin, I believe theres 1 and 2mm ropes and alot of today's rtas require more fluff in certain areas of the deck to prevent gurgling, so you kind of need older or older style rtas like ones that have a kayfun type deck or similiar....one cool thing about silica is when the wick hunks, you can just dry burn it clean and your good to go.......once the micro coil came out the silica kind of stopped and cotton ruled.....the ceramic x wicks you inquired about are definitely better than silica and a bit thicker and can keep up with higher numbers than I mentioned and have a better chance of being threaded thru a coil, but I didnt have the best of luck doing it that way and still wrapped my coil around the ceramic rope (soft ceramic) you can also dry burn it like silica . When these came out there were some companies not treating the ropes properly (they must be heat treated to really high temps for them to be safe) , but I'm sure now that isnt the case.....I only use rayon now and luv it and never would think of using ropes again...good luck