TFV8 Series V8-T8 Octuple Coil Head Overview.Smok's patented high-octane V8-T8 replacement coil heads are the most powerful heads of the TFV8 bunch. These replacement heads have a resistance of 0.15 ohms and recommend an operational wattage range between 50-260W (best results at 120W-180W). These heads are wicked with Pure Organic Cotton, offering a deep and rich flavor in addition to colossal clouds. The replacement V8-T8 Octuple coil heads are exclusively compatible with the TFV8 Cloud Beast only.TFV8 Series V8-T8 Octuple Coil Head Features strong and Pure Taste. Organic Cotton, Kanthal Heating Element. Resistance: 0.15 ohm. Recommended Wattage: 50W - 260W / Best 120W - 180W. Sold as Single Units or Pack of 3.