The Chronus has a precision machined chassis that is constructed with Zinc Alloy & Aluminum Alloy and houses dual 18650 batteries. This Sigelei Chronus starter kit includes the 24mm Shikra Tank with 2mL maximum e-juice capacity and preinstalled 0.25ohm MS Coil - rated for 40-80W, the Sigelei Shikra Sub-Ohm Tank has a knurled top refill system with dynamic dual slotted bottom airflow for excellent cooling properties, outstanding flavor, and voluminous cloud production.