Control the air pressure in the air helper springs for varying loads and road conditions. Spring performance can be altered as easily as inflating a tire. Made of durable, elastic polyurethane. Per set (not to exceed vehicle's GVWR). The item "JEEP GRAND CHEROKEE WH/WK HD HP FIRESTONE COIL AIR BAG SUSPENSION SPRING KIT" is in sale since Tuesday, October 18, 2016.This item is in the category "Vehicle Parts & Accessories\Car & Truck Parts\Suspension, Steering\Coil Springs". The seller is "ozautoparts" and is located in Melbourne. This item can be shipped worldwide.