I got tired of waiting for the 10 pack of coils with sleeve to be available here in the States so I picked up two Estoc Tanks. These are very well made tanks that efficiently hold 4 mls in a small size. I have the ceramic coil in one and the clapton in the other, trying to figure out which coil I prefer. So far they are both excellent and I have no preference. One thing that strikes me is that the Clapton coil doesn't need nearly the 40 - 50 watts they claim it does. I get a great vape at 30 watts.