MT BCC 3.0ml Clearomizers have a metal tube with a window. The wicks and atomizer are located on the bottom of the carto to stay wet. It is compatible with eGo/eGo-T/eGo-C/eGo-C Twist battery Its coil can be replaced easily with very low cost. It has 2 detachable parts: cartomizer body, coil unit. Resistance 1.8 +/- 0.2ohm. How to refill the cartomizer: 1. Turn upside down, screw off the coil unit. 2. Fill with liquid being careful to not overfill. 3. Carefully screw on the coil unit and clean any spilled liquid. 4. Allow 1-2 minutes for the E-Juice to soak into the coil before you start vaping. Or Give the cartomizer a quick shake to make it faster. 5. Screw onto your battery and start vaping.