Crown 3 Coils from Uwell is designed for Uwell Crown 3 Tank. There are four types for options: 0.25ohm SUS316 Coil, 0.5ohm SUS316 Coil, 0.4ohm Kanthal Coil, 0.23ohm UN2 Meshed Coil. The 0.25ohm SUS316 Parallel Coils features a wattage range of 80-90 watts. The 0.5ohm SUS316 coils features a wattage range of 70-80 watts. The 0.4ohm coil still uses the same SUS316 shell but uses an A1 Kanthal core for the wire. The 0.4ohm coil features a wattage range of 55-65 watts. The 0.23ohm UN2 Meshed Coil supports 65-75W wattage, delivering nice flavor and massive clouds. Get it as a spare part. There are 4pcs each pack.