I just got these a few days ago,3-1.5 ohm and 3-2.5 ohm and I am loving them.I loved the original cannons too but they had leaking problems which I can tell you by using these have been fixed.They are 510 connection with what looks like 801 internals but there could be more to them who knows.From the first vape these were great without any type of break in.Flavor was the best I have had so far with lots of vapor and a great medium draw.I didn't really think they would improve with use but they have as they were broke in.I like these better than the i06 and 801 minis and will be using these from now on.Hopefully the atty life is as good as its performance.Try these out if you get a chance guys.