CoilART Mage Mech V2.0 Mod comes with brass construction and painted with the electroplating frosted black. It features self-adjusting battery contact and supports the dual battery in series stackable. It is compatible with 18650, 20700 and 21700 battery. With Hybrid 510 connection, most of atomizers could contact the battery directly for better power transfer and a harder, faster hit. The Mage Mech V2.0 Mod also features internal insulation protection to ensure the safety. 25mm of the top 26mm of the tube 91mm overall height Brass construction Electroplating frosted black Internal insulation protection Hybrid 510 connection Silver and golden fire pin Dual battery in series stackable Features self-adjusting battery contact Powered by 2 x 18650/20700/21700 (Sold Separately) Brand: CoilArt Model MAGE MECH V2.0 Version Stacked Edition Size 91 x 26mm