N1: 5 x Voopoo UForce N1 Coil 0.13 Ohm Power Range 50-100W Optimal Range 70-80W N2: 5 x UForce N2 coils 0.3 Ohm Power Range 45-80W Best Power Range 55-65W N3: 5 x UForce N3 coils 0.2 Ohm Power Range 65-100W Best Power Range 75-85W