Powerflex's Black Series Suspension Bushes replace the original rubber bushes in your car's suspension with Powerflex's hardest Black SHORE 95A compound. Designed for the track, these bushes are ideal for more demanding driving conditions where maximum control of chassis geometry is essential.Firm up suspensionReplace worn bushesFinetune suspension handlingMost cars come with rubber bushes in their suspension from the factory. While this is fine for road use, offering good NVH (noise, vibration & handling) properties and low cost, for track use, OE rubber bushes can quickly prove to be the weak link to your suspension, especially after upgrading other performance components like tyres and suspension. With age and wear, rubber bushes can introduce undesirable compliance, which can allow motion in all directions, not just the intended one the suspension component was designed to move in. This can negatively affect the alignment of the car under load, introducing geometry and handling characteristics that you don't expect or necessarily want.Powerflex bushes are manufactured from tough polyurethane compounds that do not suffer from age-related perishing and failures seen in many OE rubber bushes. Their black series bushes use their hardest SHORE 95A compound. These bushes are on average a further 25% stiffer than their Road Series (purple) compound and up to around 80% stiffer than stock rubber bushes, whilst retaining similar OE-level noise absorption characteristics.In applications where additional vibration is not a problem, this makes for the very best response and control. Using these bushes will help ensure the rest of your suspension does exactly what it is supposed to.Please note:- These bushes are significantly stiffer than the original rubber bushes and Powerflex recommends track use only.