The Vape Pen Tank by Smok is a starter sub tank that Smok used for their affordable starter kit, the vape pen 22. The Vape Pen sub tank is a cost effective sub tank that can output clouds. The tank utilizes a unique coil structure from the Beast sub tank line. The tank comes with two 0.25 ohm coils that can go up to a maximum of 50w. The tank can hold up to 2ml and is a compact sub tank that has outstanding cloud production at a affordable price.