Monroe 72504 OESpectrum Sensa-Trac Front Strut Assembly 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: The fluon band provides consistent sealing between the piston and pressure tube which delivers better control and increased durability. Twin Technology: Impact Control Valve (ICV), delivers exceptional control under virtually all driving conditions, and patented Low Speed Tunability (LST) piston design that isolates impact-related noise, vibration and harshness. Hardened and Chrome Plated Piston Rod: Long service life.