The IJOY X Replacement Coil is designed for the subohm tank with huge vapor and nice flavor. The X3-C1 Dual Coils 0.4ohm and X3-C3 Sextuple Coils 0.2ohm, X3-C1S 0.35ohm (40W~80W), X3-MECH 0.15ohm coil (40W~90W) for you to choose from. 3pcs each pack. Get them as spare parts for your Tank