These replacement atomizer heads are designed for the Joyetech eGo AIO. The eGo AIO has multiple types of atomizer heads. The 0.5 Ohm (DL) Heads are designed for Direct to Lung inhale. The 0.6 Ohm (MTL) atomizer head is intended for mouth inhalers as it mimics the feeling of taking a puff. With a tighter draw, it is perfect for people who want to enjoy the same sensation as smoking a real cigarette. The 1.0Ohm (MTL) is for the folks that don't enjoy the large volume of vapor that comes from the 0.6 Ohm MTL.
These eGo One replacement coils are exclusively designed for Joyetech eGo AIO kits. You cannot use them with other cartomizers from Joyetech or different brands.