The special dual coil design uses USA Kanthol wire at 1.6 ohms and a maximum absorbency wick to ensure high performance. Fill e-liquids from the top. Stainless steel or gold finishes. Gold tanks feature real gold plating! Adjustable air flow control. Standard 510 thread. Comes with collar for fitting smaller batteries. Includes a spare coil. Use with any larger SV batteries (like Pandora, Vogue, Cuboid, Torch or Evic).