Claptonized A1 coils with 0.25 ohm. With the 0.25 ohm coil, you can vape with wattage between 40 – 50 watts. With the 0.4 ohm coil, wattage should be between 45 – 55 watts. Get ready for billowing clouds of vapor with this 4-pack of Nunchaku Coils by Uwell!