All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reactionFull Displaced Valving: Better valving range on both the compression and extension cycles of the unit for a smooth comfortable rideSintered Iron Piston: Stronger than traditional metals, enhances durability for longer service lifeNitrogen Gas Charged: For improved ride and handling, helps maintain tire to road contact by reducing aeration2" Reserve Tube: More fluid for more consistent performanceThe 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" bore shocks, Monroe Gas-Magnum truck shocks work more efficiently with less effort.