Replacement Coils :
First of all, all atomizers has something inside which is called the atomizer head. You probably are more familiar with the name replaceable coil.
The key in order for the battery to interact with the liquid, is the atomizer head. As a result, it evaporates the liquid into a vapor which you inhale.
Furthermore, there are a variety of resistances for each coil.
Each resistance will give you different flavor. And will also give you a different amount of vapor. Finally , each atomizer has his own compatible coil.
Note: Try now the new technology in coils, the MESH COIL.