These are the optional Team Integy Alloy Rear Suspension Arms for the HPI E-Firestorm and Nitro Firestorm Vehicles. FEATURES: Alloy construction Anodized blue in color INCLUDES: Two Rear Suspension Arms REQUIRES: Installation on the vehicle SPECS: Length: 102mm (4") Width: 40mm (1.6") Height: 18.4mm (0.72") COMMENTS: Also available in Silver (INTC9468) IntegyPart INTT6629BLUE