The CE4 Clearomizer is a very basic, entry-level vape tank for use with an eGo style battery or kit.
Available in a variety of colours, the CE4 features a 1.6ml capacity and is designed to be disposable once the coil has expired (it has a life of roughly two weeks, depending on use). It's very easy to use - just unscrew the mouthpiece at the top, tilt the clearomizer to 45 degrees, and fill with your chosen e-liquid.
The tank has a number of trailing wicks to soak up the eLiquid, but if you prefer a wickless clearomizer, take a look at the alternative CE5 tank.
For something a little more robust that's not disposable, you might want to have a look at the Aspire K1 tank.