Designed with a slippery JetFlow teardrop shape, the Yakima JetStream Base Rack Bars deliver aerodynamic efficiency, robust carrying performance, and quiet travel at highway speeds. Part of the new Streamline System, the JetStream Base Rack Bars mount to Yakima's Timberline, Ridgeline, and Skyline Towers sold separately. The JetStream Base Rack Bars include two crossbars and four endcaps. Designed with wind tunnel testing, the JetStream's ultra quiet, efficient design slips through headwinds with effortless precision. Seamless extruded aluminum provides maximum strength, courtesy of JetTruss internal support. Its anodized finish accentuates your vehicle's sharpness. Plus, its T slot with SmartFill push down enables easy mounting and accessory attachment without creating excess drag.