This is the Rear Carbon A-Arms for the Associated RC10T4 truck. These are an optional, non-stock upgrade. Made of a black, strong, carbon fiber Captured shock mount One Left rear suspension Arm One Right rear suspension Arm Trimming parts from tree Length of arm: 3.94" (100mm) Stock replacment rear arms are ASCC7448. Stock replacment front arms are ASCC7446. Optional front carbon arms are ASCC7447. NNA 8/19/03 ir/jxs &