Proforged 101-10436 E-Coated Front Lower Ball Joint 1,000,000 Mile warranty; You can install our ball joints with confidence knowing that every part we sell is backed by our industry-leading 1,000,000 Mile limited warranty Crazy strong ball joints; Proforged ball joints are built using some of the toughest steel on the planet; Forged SAE4140 chromoly steel studs are enclosed in forged SAE1045 housings, heat treated for strength and durability Built for professionals; There's a reason why the most well-respected performance suspension brands use Proforged ball joints - we're fanatical about quality, performance, and durability What is a ball joint? A ball joint is an enclosed spherical bearing that connects the control arm to the steering knuckle or spindle - it is a ball-and-socket design, just like your hip, and it needs to be replaced as it wears out Buy with confidence; There's a reason that the most well-respected performance suspension manufacturers buy from Proforged; We're the only brand of chassis parts that offers race-day performance at a price within your budget