The Innokin Endura T18 Coils 1.5 Ohm (5 Pack) is a pack of five replacement coils for the Prism tank used in the Endura T18 AND T22 Vaping Kit. Just like the ones that come with the iSub Tanks, these replacement coils have the resistance of 1.5 Ohm and include Japanese organic cotton. Thanks to the “No-Spill Coil Swap System”, they can be replaced in a matter of seconds and without a hassle. 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. This means that a 5-pack of replacement coils is sufficient for approximately 1 to 2 months of vaping. You will know when it's time to unpack a new coil when your tank will stop producing vapour and/or E-Liquid will start to taste differently - less delicious.