Combining modern aerodynamics with old-school muscle, the new CoreBar is the first aero bar built with roll-formed steel&';s strength, utility and durability. The JetFlow(TM)design is wind-tunnel tested to reduce drag for less wind noise and better fuel economy, and the galvanized steel delivers proven load-bearing performance. Wind tunnel tested JetFlow(TM) teardrop shape is strong, quiet and exceptionally aerodynamic Roll-formed galvanized steel holds the load Sleek aerodynamic design looks awesome on your car&&';;s roof Vinyl wrapped for durability and corrosion resistance Includes CoreBar SL Adapter to integrate with all StreamLine System Towers Available in 4 sizes: SM (50"),MD (60"), LG (70") and XL (80")