The Aspire CE5s BVC (bottom Vertical coil) Glassomizer clearomizer is a unique design with a new heating element coil technology which is Bottom Vertical Coil or BVC. The Aspire CE5s is made of stainless steel to give a much better vaping experience without the possible taste of plastic. As bottom vertical coil clearomizer types are becoming popular, the Aspire CE5s BVC tank holds approximately 1.8milliliter of liquid capacity. The tank can be disassembled into four total parts for easy cleaning and maintenance. Coil heads can be easily replaced by unscrewing the bottom end cap. How to use To fill the tank unscrew the base unit. Hold the tank upside down and fill with approximately 1.8milliliter of liquid (along the side of the unit, avoiding the air hole). While it is still upside down screw the base back onto the tank. The Aspire Clearomizer is now ready for use. Once the atomizer head on your Aspire tank is burnt out, replace with a new atomizer head . To do this, unscrew the old atomizer from the tank's base unit and change over.