The XL Viking is new to Avid Lyfes' lineup. XL Viking is the newer brother of the popular Able. WARNING: For advanced users only. Rebuild-able atomizers and mechanical mods require a basic knowledge of Ohm's law, battery amperage, electrical resistance, as well as experienced coil-building. Vape only within the safe limits of the battery you use. Build and use at your own risk. Axis Vapor is not responsible for misuse of product or user error.