Empty Refillable blank cartridges allowing you the ability to re-fill your own cartridges with any flavor or strength of “Totally Wicked E.Smoking Liquid” or E.Liquid you want to use. Re-Fill them time after time, changing every 10-15 top ups, although this is really down to the individual but we feel it to be a good recommendation as the lint gets tired and clogged if over used. All cartridges come sealed in a sterile wrapper.