X series eliquids 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 great for sub ohm devices. The salts are made for smaller devices as they are a 50/50 mix. The shortfill eliquids come complete with complimentary nicotine shot for free too.