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);