These tanks are a great entry level model for those getting started on their first devices. They feature a replaceable bottom coil, 3mL size tank, and built in drip tip that does not need to be replaced (it's permanently attached). If well maintained, you will more than likely lose it before you ever need to replace it. We recommend changing the heating coil every 2-3 weeks, depending on your personal habits. We stock these in clear or blue, and also keep the replacement heating coils in stock. This model holds an abundant 3.0 mL of liquid, includes a 1.8 Ohm resistance atomizer head, and has a mL display on the side. Compatible with all 510 threaded / eGo bases.