These are considered specialist atomizers and are not suitable for use by those who do not have an understanding of battery safety, Ohms Law & rebuilding.
Rebuildable atomizers and tanks are the next step up in the vape world after sub-ohm vaping. Rather than replacing coils, you can rebuild them. Rebuildable Dripping Atomizers (RDAs) are used to drip e-liquid directly onto the coil and wick to provide a more intense flavour from your juice.
Those making the switch from Sub Ohm Tanks to either RDA’s RTA’s or RDTA’s would be able to rebuild their own coils and replace the cotton within allowing for better flavour and larger clouds.