The Monroe Shocks & Struts Shock Absorber is designed to provide superior durability and force absorption for semi-trucks. It helps protect suspension parts from vibration damages, minimize wear and tear and reduce excessive vibration. Engineered to handle the demands of high mileage and severe use, this shock absorber is nitrogen gas-charged to maintain tire to road contact by reducing aeration. FleetPride is your First Click in Heavy Duty®.