Warning: These coils are sub-ohm resistance. These coils should only be used by experienced users. Extra safety precautions should be practiced when using a sub ohm tank. These coils will only work on a mechanical mod or a regulated mod capable of firing sub ohm atomizers and coils. For example, if you have a 0.3 ohm coil, your mod must be able to fire atomizers of 0.3 ohm or lower. You must be sure that your batteries can handle sub ohm atomizers and coils. If you're using a regulated mod, make sure it can handle the amps. Improper use can lead to injury or damage. For mechanical mod users, please use 20 Amp batteries or higher. Use the OHMS LAW CALCULATOR, CHECK YOUR AMPS, and be safe!