The BVC(Botton Vertical Coil) Replacement atomizer is a unique design for Nautilus Mini tank, 1.6ohm and 1.8ohm are availabe. This unique atomizer can produce pure and clean taste with huge vapor. Though more heating time required compared with BDC coil structure, it is more power-saving and eliquid-saving. This advanced BVC coil technology patented by Aspire increases more competitiveness and success rate of becoming popular in the vaping market. Suggest getting the premium BVC coil unit on official authorized website.