ApplicationCompatible for BMW 1 Series F20/F21 2011-2019SpecificationQuantity: 2 pieces front + 2 pieces rearSpring rate Front: 8 kg/mm (448lbs/in)Spring rate Rear: 6 kg/mm (336bs/in)Adjustable damper: 24 ways adjustable damperAdjustable height: YesAdjustable camber plate: NoWarranty: one year warranty for any manufacturing defect Feature* Adjustable ride height.* Adjustable pre-load spring tension.* Adjustable damper -- This allows you the ability to perfectly dial in your coilovers system. You can enjoy confortable riding experience in all road conditions.* 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.Notice* 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.