This is an optional XRAY 1.0mm XB2 Anti-Roll Bar Set.
Anti-roll bar set 1.0mm made from special spring steel material. Stabilizes the front & rear of the car. Roll bars are easily mounted to the diff cases and can be adjusted with linkages.
Both front & rear anti-roll bars are interchangeable since they have the same design and shape. The thickness of each anti-roll bar is laser-engraved for easy identification. Anti-roll bar wires of different thickness are optionally available for fine-tuning.