Powerflexpolyurethane bushings are designed to decrease the amount of deflection in your car's suspension for better handling, driver feedback, and tire wear. Powerflex uses premium polyurethane materials for minimal NVH (noise, vibration, harshness) and increased longevity over the stock rubber bushings. The quality of Powerflex products can be seen the moment you open the box: premium polyurethanes, detailed moldings, lube holding grooves and knurls, and 304 stainless sleeves. Each kit is supplied with a copper-based grease for extended squeak-free operation. In some applications, we have polyurethane engine/ drivetrain mount and reinforcements to reduce movement for better throttle response and more power to the wheels. Bushings come in pre-determined durometers (measured hardness) from Powerflex to work best in each particular location. If you feel you need a softer or harder compound to suite your particular needs and the option is not available, contact us. We can custom order in durometers ranging from 70A(Yellow), 80A(Purple), and 95A(Black). 70A is slightly harder than rubber and works great for drivers looking for a slight increase in chassis response. 70A is not suggested in certain location due to its lack of rigidity. 80A is noticeably harder than rubber and makes a great performance street material that retails low levels of NVH. 95A is the hardest, and can be used in certain locations with minimal NVH. For most locations, 95A is used for aggressive/track use only.