The Aspire AF replacement coils are designed for use with the Aspire Flexus line of devices. There are two versions of this coil available, one for Direct To Lung vaping and one for Mouth To Lung vaping.
These are the 0.6 Ω coils which are the best option for thicker, denser vapor and an airier vape, and is more suited for a restricted DTL vaping and lower nicotine e-liquids