Diameter: 25mm; Tank reservoir: 4ml; Top fill system; Philips head screws; PEEK Insulation Direct to coil Fan-styled airflow control ring; Unique rebuildable and swappable deck system;< 19.8mm building deck; 3.5 x 2.5mm rectangle holes dual coil deck; 6.5mm diameter airhole single coil deck;< Pre-made 0.15 ohm Light-up chip coil (50|215W);