The Traxxas E-Revo 2.0 Heavy-Duty Rear Left Suspension Arm Set features a design which incorporates latest proprietary composite material. Traxxas designed this composite specifically for high loads and hard landings with just the right amount of flex to resist breaking—even in cold weather. Whether you’re sending it at the skate park, or preparing for the next speed run, these arms were built for extreme punishment. Package includes optional front right upper and lower suspension arms.