Advantage: These cartridges are user friendly and exceptionally convenient. They can be created to in shape most normal vape pens and battery models, producing them an inconvenience-free of charge option for each inexperienced persons and knowledgeable end users.GuidesGuides 2Guides 3Guides 4Guides 5Guides 6Guides 7Guides 8Guides 9Guides 10Guides 1