Tein's coil over family of products offers you a variety of options in both adjustability and pricing. The Street Flex-Z coilovers are designed for the ultimate balance of comfort and performance for street or circuit use. The damper body is threaded it's full length to offer separate spring preload and ride height adjustment. The front struts add camber adjustability. The ultimate in coil over adjustability for your NA or NB Mx5. Features: Steel construction Twin tube internal construction Full-length adjustable via threaded body and spring seat/seat locks 16-way damping adjustment Flex-Z struts are not rebuildable Kit Includes: 4 x Shock absorbers 4 x Springs (Rates: 90-05 Front 392 lbs./in, Rear 336 lbs./in.