Horizon Falcon 2 II Sub Ohm Tank comes with a fully pre-installed bulb glass tube and 5.2ml e-juice capacity. It also comes with a 3.4ml straight glass tube if you prefer a straighter look. The Falcon II tank uses the incredible Sector Mesh Coil, which has no-thread design and uses the fan-woven mesh heating wire. This wire is designed to maximize the airflow. The bottom-up coil heating system, is built to force the smoke upwards, forming a vapor compression path and making the flavor denser and the vapor more smooth. In addition the the Falcon II contains an easy push top fill design. All you have to do is simply push the top cap to side to reveal the large filling holes, then inject your favorite e-juice without any leaking! There are dual large airflow adjustable slots on the base, rotating the airflow ring to adjust the intake air freely.