Aspire ET-S BDC (Bottom Dual Coil) 3.0 m L Metal/ Glass Clearomizer The BDC line of products from Aspire are a new style bottom coil clearomizer. BDC stands for Bottom Dual Coil, & these metal tanks have a glass window to see your e-liquid levels while vaping. The tank itself holds Approx. 3 m L of e-liquid. This particular style, the ET-S BDC, has EGO threading, so make sure your device has the appropriate threads before adding it to your cart. The metal casing protects the glass & inside of the tank to reduce the chances of breakage. These clearomizers use anew style of bottom dual coil atomizers, introducing a brand new design to the bottom coil style clearomizers. Aspire BDC Clearomizer, you may have noticed "BDC", this is the big feature which means " Bottom Dual Coil" here, of course, changeable. Compare with the BCC clearomizer / glassomizer, this BDC design is absolutely an unbeatable update on those mainstream clearomizers like the T3, vivi nova, CE4, CE5 etc. The BDC Clearom...