Does not fit Nautilus!Original, Authentic Aspire BVC coils! Has Anti-Counterfeit "scratch & check" security code so you can verify these are real at the Aspire website..These are the original coils that come in the Aspire K1, and it also works will most other Aspire tanks,clearomizers, and glassomizers that use the older BDC coils. Pack of Five 1.8 Ohm coils, the same that comes in the K1.