These are the optional Golden Horizons Aluminum Rear Lower Arms for use on the Traxxas Slash 4 x 4. FEATURES: Aluminum construction Anodized silver in color INCLUDES: Two Aluminum Rear Lower Arms Two 3x26.5mm Hinge Pins Two 2x7mm screws REQUIRES: Installation on rear suspension COMMENTS: Also available in Blue (GHHC5203) Red (GHHC5204) Golden HorizonsPart GHH05205