VOOPOO UFORCE Coil is designed for VOOPOO UFORCE Atomizer. There are the UFORCE U4 Quadruple Coil 0.23ohm and the UFORCE U2 Dual Coil 0.4ohm available. The UFORCE U2 Dual Coil is fit for the wattage 40-80W and best for the wattage 55-65W. The UFORCE U4 Quadruple Coil is fit for the wattage 50-120W and best for the wattage 60-80W. The powerful OCC coil head will bring you the rich flavor. 5pcs in a pack.