Godspeed(MSS0300-A) MonoSS Coilover Lowering Kit, Adjustable Ride Height, 16 Levels Rebound Damping, Performance Upgrade Fits 2004, 2005, 2006, 2007, 2009 Mazda 3(BK); Spring Rate(Front//Rear): 7 kg/mm // 4 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