Cognito 99-18 Chevrolet Silverado/GMC Sierra 1500 Alpha Ball JointThe patented Cognito Alpha Ball Joint is the next level, end all be all solution of upper ball joints. It eliminates the problematic dust grease boot by using a durable scraper type seal that is not susceptible to damage that a traditional dust grease boot is. Although the ball joint is firmly sealed and pre greased, there is a grease fitting at top for any periodic maintenance needed. With a small internal cavity for grease, the joint does not need