These A-arms are everything you have actually pertained to expect from RPM, created to be stronger than stock and developed to tighter tolerances, making critical suspension settings much easier to lock down. The RPM A-arms include angled leading and tracking edges which are more aerodynamic and allow the A-arms to shift up and over objects a lot more quickly. Bosses have been included around the hinge pins as well, minimizing the possibility that a success will extend the hinge pin holes. The outerhinge pin locking screw has been updated with an in-line screw. This helps improve overall A-arm stamina while keeping the outer hinge pin locked sturdily in place.All RPM A-arms are created from our extremely tough blend of engineering grade nylons and are backed by our limited lifetime guarantee against damage. You cannot go wrong with RPM!