This purchase is for a Ten pack of what they call cryogenic tubes or vials but whatever they call them they are very useful to us vapers as a container for eliquids. They are technically 1ml but hold 2ml if filled to the top. Cool to have for us vapers. Do a little DIY mixing and also they are easier to carry out with you when you don’t really want to carry a bottle. They hold enough ejuice to fill a cartomizer 4 or 5 times which is enough for a night out. You might want to give your friends a sample of flavors you have been working on. They measure 1.5″ x 3/8″ about the size of a cartomizer.