The Horizon Arco Sub-Ohm Tank is a 25mm diameter chassis, threadless top fill sub-ohm tank system that introduces a vacuum plated glass tube (not available for stainless steel version) and the Arco Coil Family. Each Arco Sub-Ohm Tank comes with two coils; an A4 coil that is a 0.2 ohm, parallel quadruple coil that can be run from 70 to 80W and an A6 coil that is a 0.2 ohm, triple vertical coil that can be run from 80 to 90W. The coils house organic cotton and a flax paper liquid guiding system, making them incomparable. Airflow enters the Arco Sub-Ohm Tank via dual bottom air slots, measuring at 11mm by 3mm each and are fully close-able. Included with the Arco Sub-Ohm Tank is a 9mm proprietary delrin drip tip and a 510 delrin drip tip adapter for 510 drip tips (Not Included). With its unique vacuum plated glass tubingand stylish design, the Horizon Arco Sub-Ohm Tank is the perfect choice at an affordable price.