This atomizer head is only designed for Eleaf GS Air clearomizers.
Bottom dual coil means more vapor.
TheEcig also carries Ismoka Eleaf GS Air Clearomizer for your choice.
Resistance: 1.6ohm,1.2ohm and 0.75ohm
Note:This coil works will Ismoka Eleaf GS Air clearomizers, it is NOT compatible with the other clearomizers.