PFF5-5401BLK  is  made using  our Black 95A durometer material and supplied with  outer shells to increase bush stiffness by 300%, controlling longitudinal wheel movement under braking and cornering, and improving longer-term durability. Using POWERFLEX PFF5-5401G provides a longer tyre life, increase handling of the car and  braking stability is also improved.  The POWERFLEX PFF5-5401/5401G are 300% stiffer than the OEM  bush