These Kanger SSOCC replacement coil atomizer heads feature pure organic Japanese cotton wicks. The 0.15 ohm coils are 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 temperature sensing devices like the Evolv"s DNA 40 board, the silicone rings are blue for ease of identification. Get performance and peace of mind, pick up the new temperature sensing OCC coils for your Subtank today! The Kanger Stainless Steel Organic Cotton Coils (SSOCC) features the latest remarkable atomizer cores from KangerTech, renowned for innovation and high quality production. Engineered to add versatility to a variety of tanks, ranging from old such as the Subtank to the latest Nebox Mod and Subvod Starter Kit, it is a high-performance replacement coils for maximal vapor delivery and robust flavors. These advanced atomizers are constructed with superior stainless steel encasing the core of stainless steel heating elements, which are phenomenal for clearer flavorings while providing longer coil life than most. A variety of resistance range are available for personalized preference and amazing vaping experience.