The Uwell Crown III replacement coils have been designed for use with the Crown III Vape Tank only. There are three versions of this coil available, all of which have been designed for sub ohm vaping. For best results, we recommend pairing these coil with high VG eliquids that are 60% VG or higher. Features: Uwell sub ohm coils Compatible with high VG e-liquids Users have the option of a 0.25 Ohm or 0.5 Ohm Stainless Steel coil, or a 0.4 Ohm Kanthal coil. Stainless steel can be used in both temperature control and variable wattage mode, whereas the Kanthal has been designed for variable wattage mode only.