Spring Rates:Front: 16.0 Kg/mmRear: 12.0 Kg/mmK-Sport Sport Control Damper System model coilovers. 20-30% stiffer springs and damping than Kontrol Pro. K-Sport’s Fully Adjustable Coilover Kits provide the ultimate in suspension technology for your street or track car. Made from high quality 6061 Aluminum with T6 for increased hardness.