Monroe 801989 Monro-Matic Plus Strut All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction Nitrogen Gas Charged: For improved ride and handling, helps maintain tire to road contact by reducing aeration - on most applications Special Dust Boot/Jounce Bumper: Protective dust boot reduces dirt and any moisture build-up. Jounce bumper helps prevent severe suspension movement. Dust boot &amp; jounce bumper sold separately