This is a 5 pack of coils to replace those in the Aspire Nautilus BVC. These are bottom vertical coils which work in the Aspire Nautilus mini as well as the Aspire Nautilus original tanks. The coils have an improved design and they have organic cotton which has been found to produce a better flavor and more vapor. They also have bigger wicking holes which also gives a richer vape as well as bigger clouds, a better flavor and better absorption. The coils can be bought in 0.4 ohm, 0.7 ohm, 1.6 ohm or 1.8 ohm depending on your preference.