Ballade Sports have designed a virtually maintenance free suspension bushing using the HIGHEST quality ""American Made"" Spherical Uni-Ball joints for all the Lower Control Arm pivot points. This bushing is a must for road race enthusiast looking eliminate alignment deflection and slop from rubber control arm bushings. Ballade Sports Uni-Ball Cups use a rubber O ring to keep out contaminants, keeping the Spherical joint clean while on the road.