Spring steel anti-roll bar, 1.4mm thick. Marked with 4 laser-engraved lines for easy identification. This optional anti-roll bar offers different anti-roll stiffness adjustment so that you can fine-tune the set-up of your chassis with maximum finesse. Black colour.Both front and rear anti-roll bars are interchangeable as they have 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.