BougeRV roof rack cross bars made from high grade aluminum, base feet are made of high quality plastic. Aluminum is on average 30% lighter than steel. Our roof rack crossbars can withstand greater stresses than the best all-steel roof rack at 1/3rd less the weight. The front crossbar is longer than the rear to accommodate vehicle size. The mounting rack install and secure with just a screwdriver, easily attaches to roof mounts without drilling. Please read the installation manual before installing. BougeRV car roof rack is rated to carry 68 kg /150 lbs. Ideal for transporting items which won’t fit in your vehicle such as: roof bags, roof boxes, bike carriers, surfboards, kayaks, canoe, sporting goods, ladders, luggage and much more you want.