This product is a 5pk of the Elips Tank Cartridges

The Elips is designed for new electronic cigarette users.  It provides the benefits and power of the larger battery eGo-T or eGo-C tank systems in a smaller, more fashionable form. Rather than being the typical round shape this electronic cigarette is a more aesthetically pleasing flattened oval shape.  Which is also great for keeping it from rolling off of a flat surface.

The battery is rated at 360mah, which is roughly twice that of a standard 510 manual battery and should provide many hours of use between charges. 

Go here to see the entire Elips Starter Kit.