High-strength, 40CR chromium bar that's precision-machined to match O.E.M fitment specs. QuadBoss Replacement Axles feature a laminate coating that resists rust and corrosion and neoprene boots to create a waterproof seal. Exceeds O.E.M. axle strength. Low-profile, stainless steel clamps. High-performance molybdenum grease reduced heat and friction. Up to 20% longer cycle life, compared to the competition. Wheel Shaft