The IJOY CA coil are designed for Captain Sub Ohm tank and Captain S tank. CA2 coil head is composed of kanthal and two SS wires, getting a thicker vapor and more delicate taste; CA8 coil head is composed of four dual coil combination, increased the intake airflow, can be more quickly evaporate the e-juice, gain a thick cloud vapor. And the newly added CA3 is a 0.25ohm coil supporting 60-100W vaping. They're designed for high VG e-juices. 3pcs each pack. Get them as spare parts. TPD Version and Standard Version available.