These Seego Vhit TYPE C Coils are made of medical grade steel powered by titanium (most bio-compatible steel) inner coil, and what is more important they vape your wax and oil cleaner than any other coils out there. These replacements were produced with utmost care in order to ensure that they do not break down easily, creating a better and longer vaping experience for you. Pick up a pack of 10 and you will always have a replacement nearby in case you need it. Make sure to frequently replace coils, since over time, their efficiency may become degraded, which can influence the quality and the taste of the vapor that is produced.