The iSub Tank coils are designed to be used with the Innokin iSub and iSub G Tanks. The iSub coils are crafted from 100% organic Japanese Cotton for the purest flavour production possible and are rated at 0.2 ohm and 0.5 ohms. The iSub series from Innokin employ a new and innovative technology Innokin are caling the "No spill coil swap" system.Essentially the coil can be removed without the need to 'open' the tank. What this means is that the Innokin iSub Replacement Coil houses the 510 connector pin itself, making cleaning the iSub and iSub G Tank a breeze as well as increasing both tanks longevity.