Twin Tubes Structure: With excellent control but not lose comfort -2 Layer/1 bake powder coat: It is adopted in tube and feet tube which brings superior performance in durability and anti-corrosive property. Coilovers can be used with no problem even in snowy areas.Are for 48 states only. All we ask is you send it back in the same condition it was received-new and un-used. We guarrantee that we will solve the issue as soon as possible. Every part of the coilover shock absorber is made of the world's top material or brand: Germany Fuchs oil, NOK oil seal, 54SICr6 high-performance steel spring, T6061/T6 lightweight forging aluminum magnesium, alloy spring base and upper. Our coilover shock absorber is designed to meet the needs of drivers for different road condition. Hope to bring you a perfect driving experience!