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. We can offer this because our parts are engineered, tested, re-tested, and subject to strict quality control procedures our quality is second to none. 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. Professionals save time and money with our competitively-priced products that outlast inferior brands. Do the job with confidence replace your worn components with the leader in performance ball joints Proforged. 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