This is the optional blue ST Racing Concepts Rear Shock Tower for the Traxxas Revo monster truck. CNC Machined from high quality aluminum, our rear shock tower for Traxxas Revo 3.3 improves the strength and reduces the flex in the upper shock mount area over the stock plastic pieces and also adds great factory look to your Traxxas Revo 3.3. Direct bolt on with no modifications necessary.