BC Racing BR Coilovers 89-05 Mazda Miata / MX5 Chassis NA8C/NB8C Mono-tube shock design 30 levels of damping force adjustment, adjust compression/rebound 2 axis bushings allow precise, single wrench adjustment accurately under load. Front Spring Rate: 8kg/mm Rear Spring Rate: 6kg/mm Front Camber Plates Not Applicable, Rear Camber Plates Not Applicable Separate full length height adjustable, 1 year warranty and rebuildable