850 RBA designed for true RDL, and DL vaping included is a smaller dome chimney for improved flavor and throat Hit. 

Air Flow Pin Size: 1.5mm, 2.0mm, 2.6mm,3.2mm, 3.8mm. 

Easy coil building and wicking deck. 

Quiet and smooth air flow design.

510 threading for easier coiling 

Comes with Kraken tank (Kraken tank is fully compatible with other boro bridge)