Replacment coils for the Exgo W4 Wax Atomizer, W4 Full Kit. Also compatible with the Boom W4 Atomizer. The Nero coil works best battery operating at <3.7V and <20W output. The dual quartz coil works best around 40W.
1 ExGo W4 Nero Replacement Coil
(Note: Dual Quartz Rod Coils may be branded 'Boom')