The Aspire Nautilus X coils are cross-compatible coils that can be paired with a range of kits and tanks. This range includes the Nautilus X tank, PockeX kit, Nautilus XS tank and Nautilus Prime X kit. There are three versions of this coil available, all of which support either Mouth To Lung vaping. The U-shaped chamber in each forces vapour to travel through the coil twice - improving flavour.