Ballade Sports Rear Roll Center Ball Joint is a premium-quality, extended ball joint designed for durability. Its superior rubber boots resist tearing over time, and the strong castle nuts won t strip. This ball joint restores optimal suspension geometry while lowering your vehicle s center of gravity. With an increased height of 15mm over stock, it enhances roll center by extending the distance between the upper and lower control arms. This extension allows for longer shock travel, reducing the risk of bottoming out. Note that installing these ball joints with stock suspension will lower the car, which may be desirable for a lower ride height with stock shocks and springs. Sold in pairs, these ball joints are a direct replacement for factory parts.