Coils are circular or cylindrical wires in an electric circuit which usually has one or more turns. It is a current carrying wire which is designed to produce a magnetic field. The electro magnet is produced by the soft iron core which is placed in the coil. Here at UK vaper store you can find the best prices for GM coils. These aliens give you a great flavor as they have spaces at their edges for retaining the e-juice inside and popping up the flavor once heated. These vape coil wires work best with mechanical mods due to their super sub ohms.