YoCan ARMOR QDC Replacement Coils, a set of dual quartz rods wrapped in stainless steel, outputting delicious flavor from your concentrates. YoCan ARMOR Replacement Coils Features: YOCAN ARMOR Quartz Coil Series Dual Quartz Coils Stainless Steel Wire Heating Element Threaded Coil Cap 510 Threaded Connection Make sure to properly prime each coils and pods before use.