Integy EVO5 Rear Upper Arm, Silver: ERV 3.3, RVO 3.3 INTT3261S Description These are the optional Team Integy Evolution-5 Rear Upper Arms for use on the Traxxas E-Revo and Revo 3.3 Vehicles. FEATURES Aluminum construction Anodized silver in color INCLUDES Two Evo-5 Rear Upper Arms Two 3x9.5mm Cap Head Screws