Monroe/Expert Series 58618 Rear Sensa Trac Load Adjusting All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction Full Displaced Valving: Tuned specifically for each application, this valving automatically adjusts to road extremes to provide consistency and ride Fluon Banded Piston: The fluon band provides consistent sealing between the piston and pressure tube which delivers better control and increased durability