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ApplicationCompatible for Kia Optima 2011 2012 2013 2014 2015Note: New sway bar link is required for SX trimSpecification- Top mounts: pillow ball top mount front , standard rubber top mount rear- Quantity: 2 piece front + 2 pieces rear - Spring rate Front: 9kg/mm (504 lbs/in)- Spring rate Rear: 7.5kg/mm (420 lbs/in)- Damper: Non adjustable damper- Adjustable Height: Yes lowering 1" to 3"- Shock type: Twin tube.- Spring Preload: 7-10 mm.- Color: Golden- Warranty:1 year warranty for any manufacturing defectFeature- Adjustable ride height.- Adjustable pre-load spring tension.- Most components are made from 6061 aluminum with T6 for increased hardness -- the advantages include excellent strength, and aluminum helps keep the weight down. - Hi Tensile performance spring - Under 600,000 times continuously test, the spring distortion is less than 0.04%. Plus, the special surface treatment is to improve the durability and performance.- All inserts come with fitted rubber boots to protect the damper and keep clean.- A fast and affordable way to easily upgrade your car's appearance.- Easy installation with right tools.Note- No instruction included; Professional installation & alignment suggested.- Please check our store for other auto parts you may be interested in.- Please feel free to contact us for whatever we can help.