If Cavendish had his own handlebar, it would be the stiffest drop bar on the planet... oh wait, he does and it is. The priorities that guided the design of the Pro Vibe Sprint Anatomic Handlebar were first-stiffness, second-more stiffness, and then light weight. It's made of the same 7000 series alloy as the normal Vibe bars, but Cav's bar has internal ribbing in the form of 4 little aluminum spines that run the length of the bar and add copious amounts of stiffness to the bar.
It comes in Cav's preferred anatomic bend and has a relief underneath for dual cable routing. Use it with the matching Pro Cavendish stem for the stiffest front end set-up in the peloton.