Maintain better alignment while cornering stopping and hard launching than soft O.E.M. rubber. A must for both lowered or raised vehicles where weight transfer causes distortion. All control arm bushings are full floating and nonbinding...especially important when ride height is altered or greater suspension load is required. Better caster and camber is maintained during hard driving resulting from the correct durometer firmness. The rear control arm bushings are a must for controlling wheel hop and increasing cornering control. Many sets come complete with plated outer metal shells.