CoilART Mage Mech V2.0 Mod stacked edition is a 26mm diameter mech mod. Constructed by brass, it painted with the electroplating frosted black. With the self-adjusting battery contact, it also supports the dual battery in series stackable, and it is compatible with 18650, 20700 and 21700 battery. Moreover, the internal insulation protection is available. The innovative hybrid system, allows most atomizer's 510 pin to contact the battery directly for better power transfer and a harder, faster hit. With the gold plated contact pin, the Mage Mech V2.0 Mod can supply maximum firing and reduce heat effectively.