The Aspire Nautilus Tank uses the new Aspire BDC coil heads and has a 5ml glass Pyrex tank with an air flow control mechanism that's adjustable with the lower ring (4 settings). The air flow control allows the user to control the draw as well as fine tune how much e-Liquid feeds into the coil head. All these features makes the Aspire Nautilus a truly special atomizer and provides the absolute best vaping experience possible. Because of its shape and size the Aspire Nautilus looks fantastic on a Mod or APV style battery. Note: Compatible with any 510 threaded device (eGo).