This is a set of Hot Racing Traxxas Slash Rear Light Weight CV Splined Drive Shafts, intended for use with the Traxxas electric Stampede and Rustler models. This is an optional upgrade heavy duty splined star drive axle kit. Features: CNC machined #45 hardened carbon steel, S2 spring steel and Aluminum construction Replaces factory plastic drive axles Hard Black Anodized Aluminum Slider Blue anodized aluminum pin capture rings with rubber o-rings to prevent movement Design eliminated CV pin setscrew Hardened S2 Spring steel wheel shaft #45 Steel is black finish S2 spring in Brown finish Rubber dust boot to keep the Splined Drive for maximum protection against the elements Replaces Traxxas TRA1951 half shafts, TRA2753X stub axles, and TRA4628 output yokes Specifications: Approximate overall collapsed length: 109mm Includes: (2) Rear Cv Splined Drive Shaft spline CVD shaft assemblies (2) M4x2.5x11mm screw shafts