This is the same bar size as the Whispbar S5.

New Yakima FlushBar - an aerodynamic crossbar, with integrated towers and no bar overhang. Gives a clean, seamless look to your vehicle. The FlushBar shape maximizes strength, while minimizing drag and reducing noise levels to nearly zero. It accepts most Yakima gear mounts and cargo boxes for adaptable, multi-sport versatility.

Yakima FlushBar system needs: 2 x FlushBar, 1 x Fitting Kit

Features:

• Tower is integrated with the crossbar for a sleek, seamless appearance
• WindRidge on the leading edge of the crossbar reduces noise and decreases drag
• JetTruss™ internal support engineering adds serious strength for minimal weight
• Patented SmartFill™ technology allows for easy install of T-slot style mounts, such as the Yakima HighSpeed with SmarT-Slot Kit 1
• Compatible with almost all Yakima mounts and cargo boxes. Will require MightyMount adapters for older bike mounts
• Anchors to your rooftop with vehicle specific Yakima fitting kits (sold separately). 
• Yakima SKS locks sold separately