All Balls Racing Swing Arm Bearing & Linkage Kits contain everything required to properly rebuild the swing arm and linkage of you bike. Needle bearing shafts are made with 52100 hardened & precision ground bearing steel, all metal bushings are case hardened & plated to prevent waer & corrosion. Swing Arm Kits use POM composite washer bearings to replace the thrust needle washers for increased service life.