OBS Crius 2 RTA is a 3.5ml rebuildable tank with 25mm diameter. Designed for single coil building fans, it adopts an all new designed deck for easy & quick single coil building with a high-tech Zirconia black piece which is heat-resistant, corrosion-resistant and anti-oxidative. And the OBS style top side filling system, it can be refilled easily just by pushing up the top cap. Together with a precise airflow circulation system on the deck, dual adjustable bottom airflow and a 15mm resin material wide bore drip tip, Crius 2 RTA will bring you an excellent vaping experience with nice taste and huge vapor. Standard Edition and EU Edition in 5 colors for your selection.