The TeraFlex 6″ Rear SpeedBump Bumpstop Kit is designed for high performance Jeep Wrangler JK applications. These bumpstops allow for the reduction of suspension compressing impacts and harsh bumpstop bottoming. With these rear bumpstops, harsh impacts experienced offroad or on poorly maintained roadways will be absorbed, reducing the risk of axle housing bend and increses the ability to maintain vehicle control. Kit Includes:- Two Rear SpeedBump bumpstops- 2″ Upper Bumpstop Extensions- Installation instructions Bumpstops will not fade or dissipate under extended heavy use Microcellular polyurethane technology not affected by temperature extremes Delrin acetal resin polymer shaft is self-lubricating External shaft seal prolongs shaft life No custom adjustment or tuning Installation Instructions:999018 (JK Rear Speedbumps).pdf Fits:Jeep Wrangler JK 2 Door (2007-2018)Jeep Wrangler JK 4 Door Unlimited (2007-2018)