Godspeed MONO AIR Suspension Air Strut Bag Kit For 06-13 BMW 3 Series RWD E90 92. Godspeed Project’s Mono-AIR Strut Kit includes both front and rear struts that works with most air management system out in the market. Mono-AIR features mono-tube shock with 32 stages of rebound damping adjustments that allows you to control suspension return to proper position rapidly or slowly depends on driving condition. High quality rubber air bags are used in replace of springs that allows easy ride height adjustment, stainless steel fittings included. Due to the importance of rubber air bag role in the suspensions kit, high quality rubber material are used to withstand from drying out and cracking result in longer life when compared to cheap rubber material. Godspeed air struts are designed to be easy installation that should requires no modifications to your car or parts. Dampening Adjustability: 32 Way. Mono-tube Shock With Anodized Finish 52mm Shock Body Utilized Performance Shaft. 32 Levels Of Rebound Damping Settings, Race Spec Shock Oil With High Viscosity Index. High Quality Rubber Air Bags With Stainless Steel Fittings. Aluminum And Carbon Steel Hardware And Factory Style Mounting For Simple Bolt On Installation. G1/8 and(or) G1/4 Connectors are Included; Fits 8 mm O. 2 X Front Air Struts Assemblies. 2 X REAR Air Struts Assemblies. G1/8 and(or) G1/4 Fittings. Tool Kit Including Spanner Wrenches And Damping Adjustment Knobs.