The Uwell Caliburn G2 uses FeCrAI UN2 Meshed-H 1.2Ω and FeCrAI UN2 Meshed-H 0.8Ω coils. A coil in a vaping device is a wire that is heated to vaporize the eLiquid. The resistance of the coil, measured in Ohms (Ω), affects the amount of electrical current that flows through it and thus the temperature of the coil and the quantity and warmth of the vapor produced.