To put it extremely short, it is a coil wound on something like a 1/16 drill bit, using tension to wind the coil so that all winds are touching. The coil is grounded and seated into the coil body while still on the drill bit , so the coil is tight. The coil is then grounded, and pulsed/dry fired without any wicking material. Due to the properties of the Kanthal wire, the coil adheres to itself, making it extremely tight and stable.
http://www.e-cigarette-forum.com/fo...-contact-micro-coil-rebuilding-tutorials.html
All the details are here. The process of building tension micro coils has been detailed and perfected by mactechvpr. He's helped me through the process I've linked you to. Not to say it's just his procedure, but the research and work he's done on getting these coils to where they are today is due in part to his hard work.