TeraFlex Bump Stop Kits add additional protection to your suspension over the factory bump stops which can deform during hard compression and suspension movement. Our innovative bump stops meet the demand of high-performance driving. Composite construction combined with a progressive nature reduces suspension compression impacts and harshness when bottoming out whether driving off-road or on poorly maintained highways. Reducing this impact increases driver ability to maintain vehicle control as well as reduces the risk of bending an axle housing tube. These maintenance-free bump stops don–t require any adjustment or tuning. Foam" Progressive Bump Stops are constructed from a performance-tuned high-density closed-cell nitrogen charged microcellular polyurethane technology that will not fade or dissipate under extended heavy use to maintain its progressive nature. This material is unaffected by temperature extremes and retains its flexibility under thermal or sub-zero temperatures. These bump stops are a full 1.5" longer than stock. Proper bump stop length and/or bump stop strike pad height is crucial for preventing damage to axle housing tubes suspension components shock absorbers and fenders. Progressive Bump Stops simply pop-in to the existing factory locations.