The OXVA Origin X Replacement Unicoil is best for OXVA Origin X 18650 Kit. The OXVA Origin X Unicoil comes with different resistance of 0.3ohm Mesh Coil/0.5ohm Mesh Coil/1.0ohm KA1 Coil/0.2ohm Mesh Coil for your selection. The OXVA Origin Uni RBA Coil adopts 0.6ohm Pre-built coil. You can install it and change your OXVA Origin X Cartridge to an RBA….