Aspire Nautilus (BVC) Coil Head (1.6, 1.8 & New 0.7ohm) For use with Aspire Nautilus Mini Clearomizer. The Bottom Vertical Coil (BVC) is designed to last longer, whilst giving the purest, cleanest taste. A new revolution in coil technology. Available in resistances of 0.7ohm, 1.6ohm and 1.8ohm - ideally suiting batteries with voltage of 3.3-6.0v Please note: these coils are compatible with the Nautilus and the latest Nautilus 2 Tank. How to replace the coil unit 1. Turn the clearomizer upside down, and screw off the bottom base. 2. Screw off the old coil unit from the bottom base, put a new coil unit on it. 3. Screw back on the base and enjoy. Please be sure that the coil unit is screwed into the cartomizer tightly. After refilling, allow 1-2 minutes for the e-juice to feed into the coil before you start to vaping - or give the cartomizer a quick shake to speed up the process.