90% of the ego-t starter kits come with 5 tanks, 2 batteries, and 2 atomizers. The two atomizers although they look identical, one is a standard atty and the other is a low resistance atty. The LR atty burns hotter which in turn produces more vapor. I use standard attys until i use a juice that dosent perform well enough for my liking, pop the LR on and it improves throat hit, flavor, and vapor. Good luck, happy vaping!!!