The Aspire Vivi Nova BDC (bottom dual coil) clearomizer types has been revolutionized with a new heating element coil design. The Vivi Nova BDC tank is reinforced with a Pyrex glass material and holds approximately 3.5ml of liquid capacity. The tank can be disassembled into five total parts for easy cleaning and maintenance. Coil heads can be easily replaced by unscrewing the bottom end cap. The plastic 510 drip tip, that is included can be interchangeable with your favorite tip design and each unit includes one coil head (1.8ohm rating).