The Innokin Endura T18E Coils 1.5 Ohm for the Prism tank used in the Endura T18E AND T22E Vaping Kit. Japanese organic cotton and the“No-Spill Coil Swap System”, they can be replaced in a matter of seconds and with ease. To change the burnt out coils, open the base, remove the old coil and replace it with the new one. Close the base and the tank is ready for vaping again. Depending on whether you're light, moderate or heavy vaper, one coil will last from 1 to 3 weeks.