These shocks have an option for a sport, moderate tow haul, and heavy tow haul adjuster for the rear shock. They also have a version of zone specific tuning with an internal negative-rate coil spring that eliminates top out clunk in the extension zone and similar function in the compression zone. These kits include vehicle specific microcellular progressive bump stops for the front and rear and the rod end has a sealed spherical bearing with a grease fitting. Because they are aluminum they are highly resistant to salt spray or adverse weather conditions that cause rusting, and they have a 3 year warranty.