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 1.6ohm or 1.8ohn depending on your preference. It is wise to change your coils often, not just to replace them with better ones, but to replace them as they age. With time you will find that the coils do not work so well and you will not get such a quality vape, so it is wise to have spares for when it is time to replace them.