Smoktech's new release- the Leader Series of Bottom Coil Clearomizer Tank, MBC, originated from the classic Pyrex DCT design. It adopts a bottom coil heating system. You can change the replacement coil head easily. What's more, the replacement coil head is the same as the Protank, Mini Protank, Aro Tank, Pyrex Aro Tank, Tumbler Tank, and other Leader Series tank atomizers. It's the best and newest rebuildable atomizer tank so far.