Ridetech StreetGrip Delrin control arm bushings are designed as direct replacements for OEM rubber bushings on popular GM muscle cars. These bushings eliminate the restriction and non-smooth rotation that you normally receive with factory equipment. OEM rubber bushings allow too much deflection on the control arms. Poly bushings resist smooth rotation and impose stiction. Delrin bushings eliminate the deflection and the stiction issues leading to a huge improvement in handling response and ride quality.