The Aspire General Replacement BVC Coil 5 Pack is a pack of five BVC (abbreviation for the Bottom Vertical Coil) replacement coils for the Aspire K1 Clearomiser and other Aspire clearomisers using the BDC (Bottom Dual Coil) technology. These include ET, ET-S, CE5 and CE5-S models.The BVC coils are an improved version of the BDC technology for a longer lasting vape and the best taste of your favourite E-Liquid. To suit individual preferences, the BVC replacement coils are available in three different resistances: 1.6 ohm, 1.8 ohm and 2.1 ohm. Choose the preferred resistance in the drop down tab above the order form.To replace a BDC with this replacement BVC coil, unscrew the metal bottom of the tank, then carefully unscrew the old coil and screw in the new one. Before returning the metal bottom of the tank, refill the tank if necessary.