Pack of 5. Replacement BVC coils for your Aspire Nautilus and Aspire Nautilus Mini clearomizer tank. Available in 1.6 ohm and 1.8 ohm resistance to optimize vapor, performance, and flavor. This coil system is an upgrade on the standard Aspire BVC coils, but will not function in basic Aspire tank systems. These are designed specifically for the Nautilus series of clearomizers.