Vaporesso GT Coil Heads are specially designed to fit into the NRG tank series. 3pcs in a pack.
GT2 0.4ohm 40-80W, best for 55-65W.
GT4 0.15ohm 30-70W, best for 45-65W.
GT6 0.2ohm 40-130W, best for 70-90W
GT8 0.15 ohm 50-110W best for 60-80w
GT Mesh 0.18 ohm 50-90W