The AIO coils are made from stainless steel and feature dual core heads. Great flavour and cloud production. Feature 0.23 or 0.6 ohms dual core heads great vapour & flavor rated at 25 to 40 watts. Designed exclusively for the Smok Stick AIO (0.23 ohm) and the Smok Priv one kit (0.6 ohm)organic Japanese cotton wicks.