The Uwell Crown 4 coils have been designed for use with the Uwell Crown 4 Tank only. There are three versions of this coil available, all of which have been designed for sub ohm vaping.
The 0.2 Ohm and 0.4 Ohm uses Stainless Steel (SS904L) rather than standard Kanthal, so these coils heat faster and increase both flavour and cloud production. The 0.23 Ohm UN2 coils feature a mesh build that has a larger surface area for increased flavour.
All of these coils are recommended for use with high VG eliquids, that are 60% VG or higher.