The Durandal replacement coils are designed to be used with the Durandal Kit, and are available in 3 resistances. 0.4ohm, 0.16ohm and 0.25ohm The 0.4ohm Coil is a single mesh coil and is best at around 40w and will provide a nice balance between flavour and vapour production, the 0.25ohm coil provides a warmer vape and allowing for higher wattage whilst also being great on flavour thanks to the dual mesh structure, and the 0.16ohm coil is a single mesh constrution and will produce the most vapour production out of all 3 and will allow for a great wattage output.