6061-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 bracketsFront comes standard without top mounts for this chassis. The Rear Top Configuration assembly is pressed in rubber.Spring rate: 7kg front,  3kg front.