Product Features:Solid Brass Construction18350 battery mode only23mm tank area to fit up to 23mm tank sizeTank sits perfectly in side of the mod for stealth vaping and sleek lookRBA Extension is included to raise the 510 up to fit all your favorite RDAs (Top Mount Adaptor)Beautiful, Simple, and Highly Conductive!Brass ContactsUltra compact and perfect for stealth vapingReverse threaded switch housingFiring switch is designed at the top for ease of use and creates a sleek look!Juice window for airflow and ability to check juice levelMade In USALimited Quantities and Collector's Piece!