This is a pair of RPM Blue Rear A-Arms for the TRA Revo. Constructed of composite nylon Angled leading and trailing edges eliminate dirt build-up Fits left or right side One Upper and one Lower Rear A-Arm for the TRA Revo with 16mm screw for shock mount rod Installing on vehicle Lower Upper Length: 6" (150mm) 4.9" (125mm) Width: 2.6" (66mm) 2.7" (69mm) Two of these packages are required per vehicle. jxs 2/24/05 ir/jxs &