2010 - 2016 Genesis Coupe Street Basis Z Coilovers by Tein Tein Street Basis Z coilovers are the latest in the Tein coilover lineup. Tein has simplified their manufacturing process and were able to significantly reduce prices on their popular coilovers without sacrificing quality and craftsmanship. The Street Basis Z is strictly a ride height adjustable kit. This makes it a perfect setup for the daily driver looking for an increase in handling performance without compromising comfort for everyday use. For many people considering a lowering spring and performance shock absorber combination, the Street Basis Z makes even more sense as Tein selects appropriate spring rates and valves the dampers to match. No guesswork on the end-users part in trying to match one brand of springs to another brand of shock absorbers. The added height adjustment feature allows the end-user the ability to adjust ride height to their preference, something that lowering springs lack. Features Steel Construction No-Sag Springs Twin Tube Shock Absorber "TEIN Green" Powder Coated Body 1-piece Aluminum Spring Seat with Delrin Thrust Washer