Designed for and used by the US Military, the Foam Cell Pro shock absorbers are the strongest, most reliable in the market that will serve you for a lifetime. They require less maintenance than other performance shock absorbers and are rebuildable by design. Foam Cell Technology:Increases shock performance & eliminates shock fade by increasing thermal capacity and eliminating high internal pressures. Twin Tube Body:Increased oil volume for improved cooling and endurance. Twin tube construction protects internal components from rock damage. Hard Chrome Piston Rod:Hardened and polished, volumetrically balanced to piston size. Flexible Rubber Bushings:Offers quieter operation and reduces damaging side loads from shock absorber. Supplementary Welded Mounts:Fusion welded and supplementary welded for maximum strength and reliability. Single Piece Billet Eye Rings & Stems:Ultra robust design prevents breakage or bending of mounts. Vehicle Specific Valving:Every part number is specially valved for each vehicle application, this ensures the best possible ride and handling as intended by IRONMAN 4X4 suspension engineers. Extended Travel:Extended travel over OEM suspension. Suitable for standard and raised height vehicles, additional length increases wheel articulation. Impact Stone Resistant Shield:Steel or Polyethylene dust shield protects piston rod from impacts and road debris Notes:** Vehicles with independent suspension must maintain a minimum of 60mm downward suspension travel Fits:Toyota Tundra (2007-2021)