First of all, let's clarify what Ohms are. An ohm is the measure of electrical resistance of the coil inside an atomizer or tank. It is normally shown using this symbol - Ω. The more wraps a coil has and the thinner said wire is, the higher the resistance and fewer, thicker wraps of wire tend to be a lower resistance. Any atomizer coil with a resistance bellow 1.00 ohms such as (0.50, 0.15, etc.) is a sub ohm coil. Therefore since the VooPoo PnP coils come in a resistance of 1.0 and less the VooPoo Drag X is classified as a sub ohm kit.