Replace the stock plastic rocker arms on your Traxxas Revo with these Aluminum Rear Rocker Arms from Golden Horizons. Aluminum construction, blue in color. 120mm total travel (80mm up and 40mm down) INCLUDES: Two front rocker arms REQUIRES: Installation with hardware included in the Revo model SPECS: Total Travel: 120mm (4.72). Travel Up: 80mm (3.2"). Travel down: 40mm (1.6") "