While carbon might be sexier, most pro riders actually use alloy bars like the FSA Team Issue Compact road handlebar. Alloy is more resilient in a crash, and the weight penalty over carbon isn't much. The Team Issue bars are made with butted AL7050 alloy, and then reinforced with a unidirectional carbon fiber wrap to make them stiffer for the sprinters out there.
Butted AL7050 construction with unidirectional carbon fiber wrap is stiff, strong and lightweight
Textured grip areas for levers and stem keep everything in place
Compact bar geometry is easy on the wrists and shoulders, thanks to shorter reach and shallower drop
120mm center section makes it easy to add clip-ons and accessories