The dual coil ceramic atomizer is the heating coil that vaporizes the essential oil in your Go.Pen or Go.Pen Plus. To use the atomizer, simply remove the mouthpiece of your Go.Pen or Go.Pen Plus, remove the old atomizer and install the new one. It's that easy. Each Go.Pen Plus ceramic atomizer has a heating wire resistance of 2.3 - 2.6 OHMs, which not only doubles the size of the vapor cloud, but uses less battery life to vape your oil and produce the perfect puff every time. This product is intended for use with essential oils and herbal extracts in states where the sale and consumption of such oils and extracts are legal. *Note: All atomizer sales are final. Returns will not be accepted.