This is the optional Hot-Racing Light Weight 3-Shoe Clutch & Flywheel Kit.                                                                                    FEATURES: Fits the Traxxas 2.5, 2.5R, and 3.3 engines used in the Revo, T-Maxx, Nitro Rustler, Nitro Stampede, and Jato                                       Light weight flywheel constructed of CNC machined 6061-T6 aluminum, anodized blue in color                                                        CNC machined 7075-T6 aluminum clutch shoes, anodized silver Spring steel clutch springs                                                     Thirty day limited warranty beginning at date of purchase-valid in the United States only                                                                                                                           INCLUDES: Flywheel                                                                        Three Clutch Shoes                                                              One Brass Flywheel Collet                                                       Three Clutch Springs                                                                                                                                  SPECS:    Outside Diameter: 1.37" (34.8mm)                                                Collet Inside Diameter: 0.27" (6.9mm)