They wear out over time and must be changed regularly. Heating heads and pods with an integrated head need to be replaced from time to time in order to enjoy the great pure flavor of our e-liquid again. In addition to them, you will also find empty cartridges into which the heating heads are installed and which are filled with e-liquid. An integral part of classic tanks are also their glass bodies, and ifdamaged it is enough to buy them as a spare part and replace them in the tank.