gulliamo...

I'm not sure what the micro line is or how its properly used. I've certainly never used it for rappelling. If you can find me a link (I've gone back through the thread to find a reference, but I couldn't), or explain it in a little detail I'll be glad to give you my impressions.

Here's what I can tell you... generally thinner rope is "faster" in a rappel. Although it wouldn't surprise me that they're now making 5mm rope with a sufficient strength for rappelling, I wouldn't recommend it for the unitiated. You might find yourself getting to the ground a little faster than you wanted. Until we learn more, I wouldn't go smaller than 8 mm, preferably more like 10 mm (or 3/8").

I also forgot to mention that along with a swiss seat and a carabineer, each escaper will need a cheap pair of work gloves (with leather palm). Otherwise the rope will burn your hands, probably to the point that you wont be able to hang on. <img src="images/graemlins/shocked.gif" alt="" />

Do tell me more about this micro line, you've actually gotten me very interested and I'd like to hear about it.