1.8 ohms Clapton coils (Rated for 13–16 watts). With a kanthal base wire and a kanthal wrap these coils provide more surface area compared to standard coil designs. This results in greater vapor production which gives a noticeable increase in flavor. These coils ARE compatible with the Aspire Nautilus, Nautilus 2 and Nautilus 2S. They are also compatible with the Aspire Nautilus AIO, providing a smoother, softer draw.