Prime Choice Auto Parts SLK2137-2138-SBK910-911 Set of 4 Sway Bars High quality, brand new chassis parts Idler and Pitman Armswith low friction bearings to provide constant ease of rotation while maintaining zero side-to-side motion Bushings(polyurethane) feature excellent abrasion and wear resistance, extreme temperature tolerances, and resistance to oils, fluids, and carbons Sway Barsare made from hardened and stress-relieved high-carbon steel for long life and reliable performance Drag and Center Linksare made with hot-forged allow steel for superior strength.