The type of coil you need will depend on the brand of kit or tank you use. There is not a universal coil that fits all tanks, so ensuring you select the correct one for your setup is very important. For example, if you have a SMOK Vape Pen 22, you won’t be able to buy a set of Aspires coils to use in that tank. Most brands do, however, produce e cig coils that are compatible with different tanks or kits in their range.