Long-life System (HLS) wheel ends are factory installed to ensure proper bearing adjustment, internal cleanliness and seal performance. Customers can choose from ductile iron, AID (Dura-Light) or aluminum hub materials. HN or HP axles are available, depending on the weight and durability requirements. HLS wheel ends are covered by a limited 5-year, 500,000-mile warranty for on-highway applications and a limited 3-year, 300,000-mile warranty for off-highway hauling.