The Aspire Nautilus BVC Cotton Coils use Organic Cotton and feature new larger wicking holes. They are designed to provide the purest and cleanest flavor from all eLiquids. The Aspire Nautilus BVC Cotton Coils are the newer model of Aspire Nautilus Coils, they are “Bottom Vertical Coil” design and perform even better than the original Aspire Nautilus Coils.