Powerflex has extensive experience in automotive suspension and chassis systems and has combined these skills with advanced polyurethane manufacturing techniques. Durometer is standardized per fitment and location, so you can rest assured knowing the design engineers have selected the optimal urethane hardness for this specific part.
Note: Powerflex copper-based grease is supplied with every bushing set, and they will rarely need re-lubing due to the unique design features built into the material to hold the lubricant.
These inserts are to be installed ONLY with the stock bushings. They fill the voids in the stock bushings to reduce deflection, increase rigidity and will improve the longevity of the stock bushing. These are a great addition to your suspension and a much easier install than removing the stock bushing from the subframe.