5pcs Subohm Heavape Ecotank Ni-200 Coil/Core, it's the special coil head for only Heavape Ecotank. 0.5ohm low resistance with excellent performance and high quality.ParametersAvailable resistance: 0.5ohm (NI-CR alloy) & 0.2ohm (Ni-200)It comes with1 x 5pcs Subohm Heavape Ecotank Coil/CoreFeatures1. 0.5ohm sub ohm2. Temperature Controllable Ni-200 coil3. 100% Organic Coil4. No burnt taste5. Huge Vapor ProductionHow to replace the coil unit/coil headTurn upside down the cartomizer, then screw off the connector. Take out the old coil unit from the bottom base, replace with new one. So easy!