5ml Ego dual coil carto by Clouds of vapor....great dual coil. To my surprise the flavor was great, I was expecting a lot of filler taste due to the amount of filler in it...but there wasn't. Vapes like a CHAMP! Filling it is a breeze, there is so much room that the juice soaks right in. Only issue is, they dont consistantly work on the ego battery. I have had to put an adaptor on the battery (Like a 510 extender or 510-ego adaptor) in order to get the connection right. But if you have an adaptor or pick one up for a couple bucks, it is well worth it!