RPM Front or Rear A-arms for Traxxas Slash/Stampede 4x4 (Red) (2)This is an optional RPM Traxxas 4x4 A Arm Set. These arms can be used in the front or rear position of the Traxxas Rally, Slash 4x4 and Stampede 4x4 vehicles. RPM A arms for the Slash 4x4 and Stampede 4x4 eliminate the slop in the suspension system, tightening the tolerances around the hinge pins. Plus, they reduce the fore and aft movement of the A arms at both the inner hinge pin and at the axle carriers by better than 90% and improve the durability