Coils / Atomizers are relatively simple in construction - typically consisting of a coil that is wrapped in wicking material (which absorbs e-liquid). When a device is activated for use, vape coils draw power from the battery to produce heat and vaporize e-liquid or nicotine salts. Vape coils are measured in ohms. GREAT PRODUCTS AT GREAT PRICING BECAUSE VAPING ON A BUDGET IS A REAL THING