Replacement Rubber Bushing For Lower Rubicon Express Control Arms That Have Have A Crimped End Ring Or Have Previously Been Retrofitted To Use This Style Of Bushing. Rubicon Express Super-Ride Bushings Are Made From PTMeg Or Polytetramethylene Ether Glycol. This Material Has A 88A Durometer Rating And Is The Toughest Most Durable Bushing Material Available Commercially. These Bushings Are Easy To Install, Lubricate And Service Out On The Trail. The PTMeg Bushings Proven Flexible Design Will Increase Performance Dramatically, Provide Durability And Control, All Without Sacrificing The Extreme Articulation Rubicon Express Customers Have Come To Demand. Rubicon Express Is So Confident In The Toughness Of Their Bushings They Are Covered Against Failure By A Lifetime Warranty