This is the RPM True-Track Rear A-Arm Conversion for the Traxxas T-Maxx 2.5R & 3.3/E-Maxx 16.8.                                                                                                    FEATURES: Composite construction, black in color                                          Rugged durability and slop free movement                                                                                                              INCLUDES: Two Upper Arms                                                                  Left and Right Lower A Arm                                                      Two Axle Carriers                                                               Two 4mm Hinge Pins                                                              Four E-Clips                                                                    Two Aluminum Pivot Ball Set Screws                                              Two Delrin Pivot Ball Bushing Cups                                              Two 6x15mm Sealed Outer Bearings                                                Two 12x21mm Sealed Inner Bearings                                                                                                                     REQUIRES: Installing on the rear of the chassis