Tein VSM40-C1SS1 Flex Z Coilover Kit for Mazda Miata Front - Ride Height Adjustment: -25mm, -30mm and -35mm/Spring Rate: 7 kg/mm (392 lbs./in) Rear - Ride Height Adjustment: -25mm, -30mm and -35mm/Spring Rate: 6 kg/mm (336 lbs./in) 16-level Linear Damping Force Adjustment System Ride height adjustable shock absorber Highly-Rigid Bracket & Shell Case