Application: Fit for 1999 - 2007 Chevrolet Silverado 1500 (Classic NBS Body Only) 2WD / 4WD   V8 ONLY  Fit for 1999 - 2007 GMC Sierra 1500 (Classic NBS Body Only) 2WD / 4WD    V8 ONLY Non-HD Only   Specification: Type: Drop Coils/lowering springs Lowering height: 3" Material: （55CrSi）  steel Finish: powder-coated Spring length: 345 mm Spring rate: 20 kg/mm (1119.95 lb/in) Package included: 2x Front drop coils Dimension: 40*35*23 cm Weight: 15.2 kg     Feature: Chromium-silicon cold-wound structure with high tensile strength and resilience. Powder coating for corrosion resistance Lower the center of gravity, reduce cornering roll, and increase vehicle stability Give your vehicle an aggressive standce Notice：California Prop 65 Warning Code: MXR02FXSY