Uwell Crown 4 Tank is the upgraded version of Crown 3 which is still hot-sale in the vape market. Constructed by SS & Pyrex Glass, the Crown 4 looks durable and gorgeous. With a bubble pyrex glass tube in the package, the tank can hold a 6ml large capacity of e-juice (5ml in the normal tube). The biggest highlight of the Crown 4 is the advanced patented self-cleaning technology, the Uwell Crown 4 can absorb the e-juice in the condensation holder through regular usage and vaporize it. Moreover, the Dual SS904L coil and Double helix mesh coil is available on the tank, which will achieve heating evenly and produce excellent flavor. Besides, with the top filling design and bottom adjustable airflow system, you could enjoy easier refilling method and smooth airflow. 6 colors are optional.