The TFV4 Tank by Smok is a top filling Sub Ohm Tank that uses a hinge to open and close the top cap when filling. A unique modification presents a cutting-edge coil system, capable of running four different coil heads. It features two easy-to-use coil heads for RBA purposes, in Single and Dual coil structures. In addition, a powerful Patented Triple coil structure capable of handling up to a whopping 130 watts and another Patented Quadruple coil head that can fire up to an unbelievable 140 watts! The stainless steel base is integrated with adjustable airflow control with four large air slots for enormous airflow intake and is reinforced by high-grade Pyrex glass and a top-fill method for leakage prevention, and is capable of holding up to 5ML of e-juice. Finished with a breakthrough airflow control adaptability wide bore drip tip for maximal heat dissipation and a clean, clear taste, it offers the ultimate vaping experience! Although the TFV4 features two different RBA heads, only the single coil RBA head will come with the full kit as the dual coil head will be sold separately.