Yocan Evolve Plus Coil 5 Pack QDC Technology Replacement Coils for the Yocan Evolve PLUS Wax Pen and Yocan Evolve Plus 2-in-1 Kit. Available in both dual quartz rod and ceramic donut versions. The Quartz Duo coils are crafted with Quartz instead of traditional fiber wick for the purest experience. Quartz dual coil guarantees a crystal clean and smooth essence. Ceramic Donut 0.8 Ohm coils heat up quickly, providing you with clean, tasty hits and big vapor!