Excellent dual coil bottom fed Pyrex glass tank. Big tank lets you chain vape all day on single fill. And the coils are interchangeable with the Kanger single coils for more savings. I get around 2 weeks out of each BDC coil, so a 5-pack will last a couple of months for under $10.00. They also make the Nautilus which is a favorite amongst vapers but it's more expensive and uses a proprietary coil. Go to link below and check out the videos and reviews! Also great store/prices.

Anyvape Davide BDC V2 - $13.95 - WORLDofVAPE