Replacement Coil Head Description The TFV12 Prince Tank X6 coils are sextuple coil heads. The coils feature a 12 point wicking system for quick cotton saturation to help prevent dry hits even when chain-vaping and to assist with heat dissipation. The coil features a 0.15-ohm resistance and a wattage rating of 50-120 watts, however, SMOK recommends operating the coil at 80-100 watts. The X6 coil is designed to be the Prince coil line’s happy medium of flavor and vapor production. Includes three (3) TFV12 Prince X6 replacement coil heads.