The Crown 3 coil system has been optimized for the perfect balance of vapor and flavor production. Adopting a Parallel coil structure along with a convenient plug-pull mechanism for a fast and easy replacement process. The 0.4 ohm Crown 3 coil still uses the same SUS316 shell but uses an A1 Kanthal core for the wire. The 0.4 ohm Crown 3 coil features a wattage range of 55-65 watts. Brand: Uwell Coil SUS316 Shell A1 Kanthal Core 0.4ohm(55-65W) For Uwell Crown 3 Size 8 x 12mm Weight 10g