This is the optional MIP X-Duty C-CVD Rear Axle for use on the Traxxas Slash 4X4. FEATURES: Steel construction Black in color YOU WILL RECEIVE: One X-Duty C-CVD Rear Axle One 3.5mm Locknut REQUIREMENTS: Installation at rear drive assembly SPECIFICATIONS: Length: 39.5mm (1.56") Shaft Diameter: 5mm (0.20") lmm 07.20.10 ir/jxs &