Vapor Shark® has collaborated with Kangertech to bring the groundbreaking temperature limiting technology of the Vapor Shark® rDNA 40 to the popular Subtank family of tanks. The Subtank line has garnered glowing reviews from every corner of the vape community, but at Vapor Shark®, we wanted to make them even better! These replacement atomizer heads feature pure organic Japanese cotton wicks and 0.15 ohm coils wrapped from pure Nickel (NI-200) wire, allowing you to monitor and limit the temperature your coils are reaching. Because these coils are only for use on devices powered by Evolv's DNA 40 board, we have changed the color of the silicone ring on the atomizer heads from clear to Vapor Shark® blue for increased safety and ease of identification. Get performance and peace of mind, pick up the new temperature sensing OCC coils for your Subtank today!