OBS S1 Coil 0.6Ohm (Sold Separately) is backordered and will ship as soon as it is back in stock.
The 0.6 Ohm S1 coils use a special mesh design, mesh has a larger surface area than standard wound coils and are designed to be used at higher wattages.
Both versions of this coil work best with high PG e-liquids that are 50% PG or higher.