Rubber Front and Rubber Rear Upper Mounts6061-T6 Aluminum Top PlatesSAE9254 Powder Coated Springs6061-T6 Aluminum Lock Rings53mm Aluminum Threaded Shock BodiesPrecision machine welded STKM13C Steel Lower Mounts or 6061-T6 milled Aluminum Lower Mounts where applicable100% bolt on in place of OEM bracketsSpring rate: Front 6kg, Rear 8kg**Swift spring upgrade not available for rear.