Precision machined and heat treated solid chromoly steel center shaft, cages and ball bearings up to 35% stronger, Induction heat treated joints with premium heavy-duty, high temperature moly grease, Highest quality, most reliable, and toughest constant velocity axles on the market, Designed to withstand the most rigorous conditions and terrain, Torture tested to failure to ensure maximum durability, Exceed OEM quality in fit, form and function