Gas-Matic Gas-Matic shock absorbers are nitrogen gas charged and feature velocity sensitive valving and all weather fluid, which offers passenger cars improved comfort at an economical price. All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction. 1-3/16" Bore: Larger bore than most shocks to provide more efficient and consistent control. Nitrogen Gas Charged: For improved ride and handling, helps maintain tire to road contact by reducing aeration. 1/2" Diameter Piston Rod: Nitrocarburized rod for long service life. Special Seal: "Self-lubricating" fluid seal designed to retain gas without excessive wear or friction. FAQ Closeout Inventory Warranty Information Wholesaler Closeout items have a 30 day warranty (but still are covered by our Return Policy). MONROE Regular Inventory Warranty Information Limited lifetime on Reflex, Sensa-Trac, Quick-Strut, OE Spectrum, and Gas Magnum lines. 24 months for RV and 55 series stabilizer shocks. Strut/Shock mounts, "-Matic", and "Max-Air" lines no warranty. 90 days on other products. Monroe brake products are warranted to be free from defects in materials and workmanship. Warranty Details