Vertex MTL RTA is constructed of Stainless steel & glass with 22mm diameter. Hellvape Vertex RTA features two posts side by side for easy single coil building. Vertex MTL RTA can adjust bottom airflow by knurled grip. The adjustable 6 air holes can offer most precise air inlet for MTL flavor. Hellvape Vertex comes with 0.6ohm & 1.0ohm A1 prebuilt coils, 2ml/ 3.5ml capacity with top filling design.