Monroe 71517 OESpectrum Sensa-Trac Strut All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction Rod Displaced Valving: Tuned specifically for each application, this valving automatically adjusts to road extremes to provide consistency and ride comfort Fluon Banded Piston: Works with the existing groove tube technology to provide responsiveness to changing road conditions Unique Groove Tube - PSD: Precision tapered grooves in the pressure tube perform like an additional stage of valving for optimum ride tuning Hardened and Chrome Plated Piston Rod: Long service life