To simplify the operation of Tank, Aspire R&D team finished thousands of designs and tests, and finally created the innovative "Attach-Pull-Release" coil replacement. Just pull down the airflow control ring, the coil will be popped up. All of our efforts are to provide convenience. Guroo tank is equipped with a 0.15Ω and a 0.3Ω mesh coils, specially designed for cloud chasers. The Aspire lead-edge coil technology with precise airflow system will bring you outstanding flavor and vapor experience.It is so easy to refill the Guroo tank. Just rotate to remove the top cap and fill your loved E-liquid.