I assume you are eferring to a Carbon/Carbon clutch??? If so, here are some of the basics on them:
-They require a warm-up period before they can grip very well, but unlike other clutch types, they grip BETTER as they get hotter
-Very durable
-VERY expensive (for the most part)
-Price is negligable due to these being "rebuildable", and are not a replacement item when they wear out. the Pucks can be replaced, without doing the WHOLE thing.
-Due to less grip in the cool phase, these clutces can still be streetable.