Application: For BMW Z4 Convertible / Roadster E85 2003-2009 2.0 i, 3.0 i, 2.5 i, 3.0 si, 2.2 i, 2.5 si For BMW Z4 Coupe E86 2006-2009 3.0 si Specification: Height adjustable: Yes, lowering 25-75mm depending on the vehicle models Damping adjustable: Available, 24 levels of rebound damping force Spring Rate Front: 10 kg/mm (560 lbs/in) Spring rate Rear: 8 kg/mm (448 lbs/in) Front spring inner diameter: 70.5 mm Rear spring inner diameter: 62 mm Spring length Front: 180 mm Spring length Rear: 170 mm Front top mount: Pillow ball Rear top mount: Standard rubber Camber adjustable: Not available Shock type: Twin tube Spring Preload: 7-10 mm Warranty:2 years Package included 2x Front coilovers 2x Rear coilovers 2x Allen wrench 2x C spanners 1x sticker Feature: 1. Lowered height adjustment from 25-75mm which allows a lower center of gravity and also adds a more aggressive stance 2. Adjustable pre-load spring tension to reduce the shaking motion to a certain extent 3. 24 levels adjustable