Godspeed(MSS0270-A) MonoSS Coilover Lowering Kit, Adjustable Ride Height, 16 Levels Rebound Damping, Performance Upgrade Fits 2003, 2004, 2005, 2006, 2007, 2008, 2009 Nissan 350Z(Z33); True Coilover Conversion; Spring Rate(Front//Rear): 12 kg/mm // 10 kg/mm 52mm Mono-Tube Stainless Steel Shock With 16 Levels of Damping Adjustment Corresponds to Daily Driving Scene To The Sunday Track Performance Internal Piston With Koyo Japan 6204z Bearing Provides Smooth Stroke; Powder Coated CNC Machined Aluminum And Carbon Steel Accessories Independent Spring Tension And Height Adjustment; Racing Grade Shock Oil With High Viscosity Index; Shock Absorber Can Be Rebuild When Worn Out 1 Full Year Limited Warranty From Date Of Purchase; Install By Experienced Professionals Is Highly Recommended Mono-Tube Shocks With Stainless Steel Body Large Oil And Gas Capacity 16 Rebound Damping Settings Independent Ride Height And Spring Tension Adjustments Adjust Ride Height Through Lower Bracket And Lock Ring Preload Spring Tension For Through Spring Seat And Lock Ring