X series e-liquids are available as 50ml shortfill's or nicotine salt e-liquids. These are manufactured in the UK; all are based on fruity flavours and create a great vape with a 70/30 mix, which is excellent for sub-ohm devices. The salts are made for smaller devices as they are a 50/50 mix. The shortfill e-liquids come complete with a complimentary nicotine shot for free, too. The slushy blends come laced with lots of fruitiness, too, resulting in a brain-freezing blast of ice that cools through to exhale.