The Kroma 217 is an all-new kit for beginners and experienced vapers alike. The new Z-Force tank and 21700 compatibility are the perfect combination of power, intelligence and innovation. The chassis is constructed from high grade Zinc alloy with a mix of brushed and chrome finish body, resulting in an exceptionally hard-wearing device. The hand grip is crafted from a range of premium materials, including real carbon fiber, glass fiber and leather. When a 21700 battery is installed, the Kroma 217 can provide up to 100W of power, with exceptional battery life at lower wattages. If you prefer smaller cells, the Kroma 217 is also compatible with 20700 and 18650 batteries.Extend coil life and maintain intense flavor output with Coil+ and Refresh modes. When flavor becomes muted, use Refresh to pulse the coil at 40% of your vaping wattage. This draws liquid into the coil and deters residue build-up.