Ensuring you are Ready for the Road Ahead , the ContiTech Rolling Lobe Air Spring 64288/1R12-375/8435 accomplishes constant and low natural frequency between tare and full load. This offers functional cargo protection, even on poor road surfaces, exceptional comfort and health protection for the truck driver, and safe driving conditions. Rolling lobe air springs incorporate a piston which allows the flexible member to roll along the piston’s surface. These air springs also offer the ability to lower or raise the truck's body height to match a ramp's elevation or to set up a compatible platform. FleetPride knows you need quality suspension and steering parts to reduce wear and tear and ultimately, downtime. Whether you need cab, truck or trailer air springs, we have the heavy duty air bags you need for a quiet, stable ride. FleetPride is your First Click in Heavy Duty .