My TFV12 came with 3 coils. All bad. As soon as it arrived I checked to make sure it had a coil in it and I tightened it all up, filled it and watched my juice stream out around the bottom. Since the entire tank full of juice leaked out all over I couldn't tell just where the leak originated. After clean up, I checked online for information on leaks. Quickly found many complaints about the coils being poorly made. A quick check showed each of my 3 had wires sticking out of the coils bottom seal. All junk. It's sad that what most agree is a great tank is so marred by such crap coils. And its made worse by SMOK including these bad coils with the new tank. Suggest people do not buy the tank WITH coils. Buy your coils separately and check each.