The Monroe Gas-Magnum truck shock absorber is designed for mid to full size， hard working pick-up trucks and vans. These units provide firm control without a harsh ride. With up to twice the fluid capacity of standard 1 inch bore shocks， Monroe Gas-Magnum truck shocks work more efficiently with less effort.Features1-3/8 inch Bore: Lower operating pressure than standard 1 inch bore units2 inch Reserve Tube: More fluid for more consistent performance.5/8 inch Piston Rod: Heavy-duty nitrocarburized rod for long service life. On non-dust shield units onlyAll Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction.Full Displaced Valving: Better valving range on both the compression and extension cycles of the unit for a smooth comfortable ride.