ERROR CANCELLER INCLUDED. RR: USE OF EDFC SERIES IS RECOMMENDED, AS IT'S DIFFICULT TO ADJUST DAMPING FORCE BY HAND DUE TO VEHICLE STRUCTURE.FRONT SPRINGS : SELECTED FROM 12,14,16K. REAR SPRINGS : SELECTED FROM 10,12,14K. US&UK SPEC INCLUDED FRONT: 14K / REAR: 12K. OPTIONAL SPRINGS- FRONT: 12, 16K / REAR: 10, 14K. PRICE INCLUDES SPRINGS.