Golden Horizons Aluminum Front Upper Arms Blue Revo Optional Golden Horizons Blue Aluminum Front Upper Arms for the Traxxas Revo. FEATURES: Aluminum Construction, Blue in Color, Very Durable INCLUDES: (2) Front Upper Arms REQUIRES: Installation onto the Revo SPECS: Length: 4-7/8" (124mm), Width: 2-1/2" (63mm), Thickness: .316" (8mm)