T6 Coilovers Lowering Coils for 3-Series E90 xDrive AWD 06-11 Coilovers Lowering Coils Damping adjustable with 24 levels of rebound damping force.Twin-tube shock structure.Front mount features pillow ball with camber plate allowing camber adjustment.Rear mount uses OE style requiring mounting components.Height adjustable with lowering range of 25-75mm depending on vehicle model.Front spring rate is 13.5 kg/mm (756 lbs/in), rear spring rate is 9 kg/mm (504 lbs/in).Front spring length is 145 mm, rear spring length is 245 mm.Coilover overall length ranges from 355mm to 385mm at the front and 520mm to 580mm at the rear.Recommended spring preload is 7-10 mm.Unit has a black body with blue spring.Package includes two front coil-overs, two rear shock absorbers, two rear spring kits, one Allen wrench, and two C spanners.