These cartridges are blanks (BLACK IN COLOR) and require the use of Vapor Juice to fill them which is a much more economical solution for our Vapor Blaster (510) and Vapor Xtreme customers. Order these blank cartridges and use them over and over again by refilling them with your choice(s) from our broad selection of Vapor Juice. Click the "Vapor Juice" tab for a full list of our Vapor Juice selection.