Those TC heads are custom designed for Eleaf GS Air Atomizers & GS Tank Atomizer.
The wire material is Nickel 200 and the wicking material is pure cotton.
Please use the heads on mods with temperature control function, like iStick TC 40W.
Compatible wattage: 30-40W
Following Eleaf atomizers are compatible with the heads:
A. Eleaf GS Air Sub ohm Atomizer with 0.15ohm TC Heads
B. Eleaf GS Air Atomizer with 1.2ohm Pure Cotton Heads
C. Eleaf GS Tank 0.15ohm Atomizer
D. Eleaf GS Air 2 0.75ohm Atomizer
Wire material: Nickel 200
Note:This coil works will Ismoka Eleaf GS Air & GS Tank clearomizers, it is NOT compatible with the other clearomizers.