We have conquered many design challenges with some pretty cool innovations. Here are two examples: The first one was eliminating the need for grease fittings or the inclusion of worthless additives which may reduce the integrity of the part. We were the very first to use splined or grooved bores which holds in our very own SuperGrease™-guaranteeing you years of squeak free operation! The other is our super trick Motor Mount Inserts for front drive "Import" cars. This unique approach lets the vehicle be driven either hard or easy without stock mount failure or any ride sacrifice. Trust PROTHANE™ to always be researching better ways to enhance the performance of our products and your vehicle.