The GT4 dual coils are made for lower wattage and greater flavour production. Using a Clapton wire the GT4 coils ensure you are getting maximum flavour.
Vaporesso GT4 Core Coils is for NRG tank and Revenger Kit.
NRG GT4 Core Coil:
Coil: 0.15 Ohm (30-70W) Best: 45-60W
– 3x Vaporesso NRG GT4 Core Coil