The coil ratings are as follows: 0.12ohm V12 Prince-T10 Decuple Coils (rated for 60 – 120W), 0.15ohm V12 Prince-X6 Sextuple Coils (rated for 50 – 120W), and 0.4ohm V12 Prince-Q4 Quadruple Coils (rated for 40 – 100W).