Ball Caps, Available in Black, or Clear anodized, and Natural (for polishing). These caps are made from 6061 billet aluminum using a spherical design which allow the sway bar to move freely as the A-Arm moves through its Arc. Caps come with mounting hardware and your choice of 3/4", 7/8" or 1" UHMW (Ultra-High Molecular Weight Polyethylene) Ball Insert. Custom bar sizes can be made on request.