Here are cheap deals for the Sigelei Slyder S & M Replacement Coils (Fuchai Go/Kaos Spectrum Kit).
Here are Sigelei Slyder S & Slyder M replacement coils that work with both the Kaps Spectrum Kit and Fuchai GLO kit. These heads were designed to have massive airflow for huge vapor output. There are several options, but the most popular is the SM6 head that fires with a 0.2ohm resistance in the range of 40 to 120 watts. However, this coil should be used in the 75 to 95 watts range for best results.