ntended for the TFV12 tank, these coils are available in a variety of resistances and come in packs of three. V12-X4 Quadruple Coil (60-200W) 0.15ohm – Deep and rich clouds. V12-T8 Octuple Coil (70-320W) 0.16ohm – Rich cloud vapor with deep flavour. ... V12-X4 Coil (60-220W) 0.15ohm