This is a pair of RPM Front Left A-Arms in Black for the Traxxas E-Revo 2.0 Brushless. While Traxxas may have beefed up the E-Revo 2.0 suspension arms, they're still not nearly as tough as RPM versions, nor are they as light. RPM A-arms weigh in 5 grams less than stock, per side, for a total weight loss of 10 grams!
RPM geometry also has its advantages. The angled leading and trailing edges not only cut through the air cleaner and more efficiently, those same edges allow the A-arms to slip up and over tall objects with less chance of a direct impact stopping you in your tracks!
RPM Revo 2.0 A-arms will not work with long travel (LT) style rockers. Upper A-arms will not work in the lower roll-center hinge pin hole.