These cartridges are so small that you can keep an extra one filled up in your on the go pack to switch out and enjoy your favorite flavors without missing a beat. This cartridge has compact dimensions of 20mm x 10mm x 37mm and an ultra lightweight of 4g. The Eleaf Elven Cartridge is equipped with a comfortable mouthpiece that is slightly transparent so you can view your e-liquid levels. To fill the 1.6mL e-liquid capacity reservoir, tilt your device and remove the anti-leak Silicone stopper. Eleaf has made this cartridge compatible with nicotine salt infused e-liquids so you can enjoy a smooth throat hit at higher nicotine levels. With draw activation, the Eleaf Elven Mod sends a 15W maximum output to a pre-installed 1.6 ohm atomizer head the second you vape from your device. To enjoy mouth to lung vaping with the e-juice of your choosing, be sure to pick up the Eleaf Elven Replacement Cartridge.