Vaporesso GT4 / GT8 / GT2 Core Coils is for NRG tank and Revenger Kit. Specifications: NRG GT4 Core Coil Coil: 0.15ohm (30-65W) 1 x 3pcs Vaporesso NRG GT4 Core Coil NRG GT8 Core Coil Coil: 0.15ohm (60-110W).