Like Fiber-glass, Carbon fiber is used as a back or interior lam. Typically it's under clear fiberglass, but not always. It's not as elastic as glass-fiber and like Kevlar fiber, it's more for rigid applications. For a linear application, like a bow back, unidirectional fibers are more efficient than the woven fabric, but don't look nearly as cool. I know unidirectional carbon fiber laminates are made, don't know if anybody makes one with a finished side that would be suitable for the back of a bow. The whole idea behind using carbon is that it's has a better strength to weight ratio than glass, so you can make a lighter bow. Although if you look at advertising, nobody is bragging about the weight of their carbon bows. Like Bully said, it's bling.