This SES Suspension Upgrade fits the rear suspension of a Chevrolet GMC 1500 pickup with MagneRide. Each laser cut piece of steel is precision bent and powder coated to ensure a quality fit. We've engineered our hollow rubber springs to deliver a progressive spring rate. In other words, the more weight that pushes down on the rubber springs the harder they work to prevent rear end sag. Whether you are pulling a trailer or carrying a heavy load in the bed of your truck, our hollow rubber springs adjust automatically to keep the vehicle level at all times. We designed each SES Suspension Upgrade to provide superb ride quality loaded or unloaded. Product Features:Cushion Road ShocksImproves HandlingEliminates Vehicle Squatting And SaggingPowder Coated To Ensure A Quality FitLimited Lifetime Warranty