The iClear16 by Innokin is great as a back up tank, or a way of quickly changing flavour.
Suitable for a 510 or eGo thread, it has a 1.6ml capacity and a replacable coil head. At this price you cant go wrong with an iClear16, perfect for beginners.
Comes in a variety of funky colours.
The iClear takes Innokin iClear 16 coils, available in 1.8 or 2.1 ohm.