Smoktech TF-RCA rebuildable Clapton coil head, recommend work on smok tfv4 mini. the tfv4 mini dual-coil RBA coil head TF RCA with four post single coil head, dual coil deck platform, compact deck. small airflow tip included for throat hit vape. the packing comes with Clapton heating coils will add more surface area and enhances wicking exposure. comes with two building screws on each side, one side is plus terminal of the deck and other is minus terminal. this TF RCA rebuilding core enables wide array of high performance customization.