Aluminum H1 4 Bar Van Rack System for RAM ProMaster 2013-On White 4X A613 crossbars, Extruded 5052 Aluminum. Max Load capacity of 1000 lbs. Aluminum System with Stainless Steel hardware Specifically designed for Dodge ProMaster Mounting bases are 10 gauge steel and 14 gauge cross bars System is powder coated to protect against rust and corrosion